研究者詳細

顔写真

チエン　チヨン
Chen Chong
Chen Chong
所属
金属材料研究所　材料設計研究部　量子機能物性学研究部門
職名
助教
学位

  • Ｐｈ．Ｄ．（清華大学）

e-Rad 研究者番号
21035446

研究キーワード 5

  • Magnetic sensors

  • Surface acoustic waves

  • Chiral helimagnets

  • Magnonics

  • Spintronics

研究分野 1

  • 自然科学一般 / 磁性、超伝導、強相関系 /

論文 33

  1. Shear Horizontal Mode Enhanced Magnetic Field Sensitivity in Strongly Coupled Magnetoacoustic Wave Sensor 査読有り

    Deqi Tao, Chong Chen, Weiqi Du, Zheng Sun, Shihai An, Mingyuan Ma, Shixuan Liang, Sulei Fu, Feng Pan, Cheng Song

    Advanced Functional Materials　e78898　2026年10月8日

    出版者・発行元： Wiley

    DOI： 10.1002/adfm.78898 　

    ISSN：1616-301X

    eISSN：1616-3028

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    ABSTRACT Surface acoustic wave (SAW) magnetic field sensors benefit from small size and low cost, but they are restricted from practical applications by poor sensitivity and limit of detection (LoD). Strong coupling, a stronger form of ferromagnetic resonance, has the potential to overcome these obstacles. While Rayleigh‐SAW exhibits limited magnon‐phonon coupling, shear horizontal (SH) SAW, with more energy concentrated near the surface, is promising to improve the sensing performance. Here, shear horizontal mode‐enhanced magnetic field sensitivity in a strongly coupled magnetoacoustic wave sensor is reported. Fittings of the dispersion anticrossing at different magnetic field directions confirm the achievement of strong coupling and tunability of the coupling regime. The sensor based on the SH mode achieves high frequency sensitivity of 2.13 MHz/Oe and phase sensitivity of 508.71 °/Oe and low LoD of 47 pT/Hz 1/2 @ 10 Hz, all of which are enhanced by an order of magnitude compared to the reported Rayleigh mode sensor. As a proof‐of‐concept, the mapping process in geophysical exploration is simulated, and the practical weak‐magnetic‐field detection capability of the miniaturized sensor is demonstrated. This work provides a new strategy to enhance the magnetic field sensitivity of the SAW sensor and opens up opportunities for practical weak magnetic sensing application scenarios.

  2. Enhanced SAW magnetic sensing via acoustic energy confinement of high-order harmonics 査読有り

    Zheng Sun, Weiqi Du, Chong Chen, Shouren Xie, Mingyuan Ma, Deqi Tao, Peisen Liu, Boyuan Xiao, Haojie Wang, Shihai An, Sulei Fu, Cheng Song, Feng Pan

    Applied Physics Letters　129　(1)　013508　2026年7月6日

    出版者・発行元： AIP Publishing

    DOI： 10.1063/5.0339542 　

    ISSN：0003-6951

    eISSN：1077-3118

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    Surface acoustic wave (SAW) magnetic sensors offer an attractive platform for weak magnetic field detection, benefiting from compact form factor and wireless operation. However, intrinsic acoustic energy leakage into the substrate fundamentally limits the achievable sensitivity. Here, we present a compact SAW magnetic sensor based on high-order shear horizontal modes to enhance magnetoelastic coupling via acoustic energy confinement. We show that the magnetic-induced phase response is governed by harmonic-dependent acoustic energy confinement within the magnetostrictive layer. The reduced wavelength of higher-order harmonics strengthens acoustic energy confinement, increasing the fraction of acoustic energy participating in magnetoelastic coupling and thereby significantly amplifying the ΔG-induced phase modulation. As a result, the proposed device achieves a superior phase sensitivity of 3486°/mT under seventh-order harmonic excitation, corresponding to an approximately 770-fold enhancement over the fundamental mode, together with a limit of detection of 17 pT/Hz1/2 at 100 Hz. Offset frequency-dependent characterization under AC magnetic field modulation further reveals stable and high-performance detection of low-frequency weak magnetic signals. These results establish acoustic energy confinement as an effective mechanism for enhancing ΔG-based SAW magnetic sensing and provide a viable pathway toward high-density and on-chip integrated weak-field magnetic sensor arrays.

  3. Broadband Excitation of Antiferromagnetic Dynamics by Acoustic Phonons 査読有り

    Shixuan Liang, Wenxuan Zhu, Chong Chen, Mingyuan Ma, Weiaqi Du, Lei Han, Yanzhang Cao, Yichen Su, Shihai An, Zhiyuan Zhou, Sulei Fu, Yuyan Wang, Feng Pan, Cheng Song

    Advanced Materials　38　(15)　e21359　2026年2月10日

    出版者・発行元： Wiley

    DOI： 10.1002/adma.202521359 　

    ISSN：0935-9648

    eISSN：1521-4095

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    ABSTRACT Excitation of antiferromagnetic dynamics is at the core of ultrafast spintronics. Coherent excitation of antiferromagnetic magnons is typically monochromatic, confined at dispersion intersections between antiferromagnetic magnons and the excitation source. Broadband excitation can be enabled by introducing electron spins in an incoherent manner, albeit accompanied by high energy consumption from Joule heating. Here, we demonstrate a broadband excitation of antiferromagnetic dynamics of 2D antiferromagnet CrSBr without Joule heating, by Rayleigh‐type surface acoustic wave (R‐SAW). Incoherent magnons are efficiently excited via the angular momentum transfer from acoustic phonons, across a wide range up to the spin‐flop field. The collinear alignment between the Néel vector and phonon angular momenta induces strong excitation of magnons with high phonon dissipation, whereas orthogonal alignment suppresses dissipation, as revealed by R‐SAW transmission. Our work uncovers a mutual interplay between phonon transport and antiferromagnetic order parameters, offering a broadband, low‐loss route to manipulate antiferromagnetic dynamics.

  4. Highly Sensitive Surface Acoustic Wave Magnetic Field Sensor Based on a Strongly Coupled Magnon-Phonon System 査読有り

    Chong Chen, Mingyuan Ma, Weiqi Du, Zheng Sun, Deqi Tao, Lei Han, Sulei Fu, Feng Pan, Cheng Song

    Advanced Functional Materials　36　(19)　e18999　2025年10月18日

    DOI： 10.1002/adfm.202518999 　

    ISSN：1616-301X

    eISSN：1616-3028

  5. Enhanced Radiation Efficiency by Resonant Coupling in a Large Bandwidth Magnetoelectric Antenna 査読有り

    Mingyuan Ma, Chong Chen, Huiping Xu, Yanzhang Cao, Lei Han, Boyuan Xiao, Peisen Liu, Shixuan Liang, Wenxuan Zhu, Sulei Fu, Cheng Song, Feng Pan

    Advanced Functional Materials　34　(48)　2408699　2024年11月

    DOI： 10.1002/adfm.202408699 　

    ISSN：1616-301X

    eISSN：1616-3028

  6. Electrical Detection of Acoustic Antiferromagnetic Resonance in Compensated Synthetic Antiferromagnets 査読有り

    Chong Chen, Peisen Liu, Shixuan Liang, Yichi Zhang, Wenxuan Zhu, Lei Han, Qian Wang, Sulei Fu, Feng Pan, Cheng Song

    Physical Review Letters　133　(5)　056702　2024年7月30日

    DOI： 10.1103/PhysRevLett.133.056702 　

    ISSN：0031-9007

    eISSN：1079-7114

  7. High-Frequency Magnetoelectric Antenna by Acoustic Excitation for 5G Communication 査読有り

    Mingyuan Ma, Chong Chen, Huiping Xu, Peisen Liu, Boyuan Xiao, Shixuan Liang, Sulei Fu, Cheng Song, Feng Pan

    IEEE Antennas and Wireless Propagation Letters　23　(5)　1518-1522　2024年5月

    DOI： 10.1109/LAWP.2024.3360947 　

    ISSN：1536-1225

    eISSN：1548-5757

  8. Magneto-acoustic coupling: Physics, materials, and devices 査読有り

    Chen Chong, Ma Ming-Yuan, Pan Feng, Song Cheng

    Acta Physica Sinica　73　(5)　058502　2024年3月5日

    DOI： 10.7498/aps.73.20231908 　

    ISSN：1000-3290

  9. Strain-Induced Uphill Hydrogen Distribution in Perovskite Oxide Films 査読有り

    Qian Wang, Youdi Gu, Chong Chen, Lei Han, Muhammad Umer Fayaz, Feng Pan, Cheng Song

    ACS Applied Materials & Interfaces　16　(3)　3726-3734　2024年1月10日

    出版者・発行元： American Chemical Society (ACS)

    DOI： 10.1021/acsami.3c17472 　

    ISSN：1944-8244

    eISSN：1944-8252

  10. Direct-Current Electrical Detection of Surface-Acoustic-Wave-Driven Ferromagnetic Resonance 査読有り

    Chong Chen, Lei Han, Peisen Liu, Yichi Zhang, Shixuan Liang, Yongjian Zhou, Wenxuan Zhu, Sulei Fu, Feng Pan, Cheng Song

    Advanced Materials　35　(38)　2302454　2023年9月21日

    DOI： 10.1002/adma.202302454 　

    ISSN：0935-9648

    eISSN：1521-4095

  11. Ordered creation and motion of skyrmions with surface acoustic wave 査読有り

    Ruyi Chen, Chong Chen, Lei Han, Peisen Liu, Rongxuan Su, Wenxuan Zhu, Yongjian Zhou, Feng Pan, Cheng Song

    Nature Communications　14　(1)　4427　2023年7月22日

    DOI： 10.1038/s41467-023-40131-1 　

    eISSN：2041-1723

  12. Realizing Metastable Cobaltite Perovskite via Proton-Induced Filling of Oxygen Vacancy Channels 査読有り

    Qian Wang, Youdi Gu, Chong Chen, Leilei Qiao, Feng Pan, Cheng Song

    ACS Applied Materials & Interfaces　15　(1)　1574-1582　2022年12月20日

    出版者・発行元： American Chemical Society (ACS)

    DOI： 10.1021/acsami.2c18311 　

    ISSN：1944-8244

    eISSN：1944-8252

  13. Oxide Spintronics as a Knot of Physics and Chemistry: Recent Progress and Opportunities 査読有り

    Qian Wang, Youdi Gu, Chong Chen, Feng Pan, Cheng Song

    The Journal of Physical Chemistry Letters　13　(43)　10065-10075　2022年11月3日

    DOI： 10.1021/acs.jpclett.2c02634 　

    ISSN：1948-7185

  14. Energy Harvest in Ferromagnet-Embedded Surface Acoustic Wave Devices 査読有り

    Chong Chen, Sulei Fu, Lei Han, Rongxuan Su, Peisen Liu, Ruyi Chen, Wenxuan Zhu, Liyang Liao, Feng Pan, Cheng Song

    Advanced Electronic Materials　8　(11)　2200593　2022年11月

    DOI： 10.1002/aelm.202200593 　

    ISSN：2199-160X

  15. SAW-driven Magnetoelectric Antenna Array with Enhanced Radiation Efficiency for High-rate Data Transmission and Microwave Field Detection 査読有り

    Mingyuan Ma, Sulei Fu, Jianle Liu, Weiqi Du, Yanzhang Cao, Peisen Liu, Shouren Xie, Boyuan Xiao, Jiajun Gao, Chong Chen, Zheng Sun, Deqi Tao, Shixuan Liang, Yuyan Wang, Tianxiang Nan, Cheng Song, Feng Pan

    IEEE Transactions on Antennas and Propagation　1-13　2026年10月

    出版者・発行元： Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/tap.2026.3745598 　

    ISSN：0018-926X

    eISSN：1558-2221

  16. Boosting Receiving Sensitivity of Magnetoelectric Antenna via Magnon-Phonon Strong Coupling 査読有り

    Mingyuan Ma, Weiqi Du, Deqi Tao, Zheng Sun, Chong Chen, Boyuan Xiao, Peisen Liu, Shixuan Liang, Shihai An, Sulei Fu, Cheng Song, Feng Pan

    IEEE Antennas and Wireless Propagation Letters　1-5　2026年8月

    出版者・発行元： Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lawp.2026.3722501 　

    ISSN：1536-1225

    eISSN：1548-5757

  17. Coupling-controlled low-dispersion quasi-longitudinal wave and its application in highly robust acoustic resonators 査読有り

    Xinchen Zhou, Sulei Fu, Peisen Liu, Boyuan Xiao, Chong Chen, Rongxuan Su, Huiping Xu, Jiajun Gao, Haoqin Ma, Shouren Xie, Weibiao Wang, Cheng Song, Feng Pan

    Journal of Applied Physics　140　(1)　014502　2026年7月1日

    出版者・発行元： AIP Publishing

    DOI： 10.1063/5.0334906 　

    ISSN：0021-8979

    eISSN：1089-7550

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    Acoustic waves in thin films always suffer from high dispersion, leading to significant sensitivity to film thickness and corresponding device instability in practical applications. The quasi-longitudinal (QL) wave, conventionally classified as a symmetric Lamb wave, is generally considered a low-dispersion plate wave. However, the mechanism responsible for its low dispersion remains underexplored, limiting the excitation and control of QL waves in complex structures beyond simple plates. Here, we show that the QL wave inherits the non-dispersive nature of the longitudinal bulk wave, whereas its dispersion is introduced by coupling with highly dispersive Lamb waves. The coupling strength is governed by their displacement similarity such that reducing their similarity suppresses the coupling-induced dispersion. Based on this mechanism, a surface-wave-like QL wave is excited in an Al/LiNbO3/SiC heterostructure. The similarity between the QL wave and Lamb waves is reduced from 0.57 to 0.16, resulting in extremely weak coupling and a nearly non-dispersive QL wave with a dispersion curve slope of only −2.6 m/s. Acoustic resonators based on this structure show less than 0.8% variation in resonant frequency corresponding to the QL wave when the LiNbO3 thickness varies from 700 to 1100 nm. Our work not only clarifies the fundamental physics of the QL wave and then isolates a nearly non-dispersive QL wave from Lamb waves but also reports a highly robust acoustic resonator that overcomes the notorious sensitivity of resonant frequency to the piezoelectric film thickness.

  18. Third-Order Nonlinear Hall Effect in Altermagnet RuO2 査読有り

    R. Y. Chu, L. Han, Z. H. Gong, X. Z. Fu, H. Bai, S. X. Liang, C. Chen, S-W. Cheong, Y. Y. Zhang, J. W. Liu, Y. Y. Wang, F. Pan, H. Z. Lu, C. Song

    Physical Review Letters　135　(21)　216703　2025年11月17日

    出版者・発行元： American Physical Society (APS)

    DOI： 10.1103/rv1n-vr4p 　

    ISSN：0031-9007

    eISSN：1079-7114

  19. Insight into spin-to-charge conversion in rutile RuO2 査読有り

    Yanzhang Cao, Da Tian, Lin Huang, Hua Bai, Shixuan Liang, Lei Han, Chong Chen, Yichi Zhang, Lei Wang, Caihong Zhang, Feng Pan, Biaobing Jin, Cheng Song

    Physical Review B　112　(6)　064415　2025年8月7日

    DOI： 10.1103/z478-fgl8 　

    ISSN：2469-9950

    eISSN：2469-9969

  20. Electrical manipulation of spin splitting torque in altermagnetic RuO2 査読有り

    Yichi Zhang, Hua Bai, Jiankun Dai, Lei Han, Chong Chen, Shixuan Liang, Yanzhang Cao, Yingying Zhang, Qian Wang, Wenxuan Zhu, Feng Pan, Cheng Song

    Nature Communications　16　(1)　5646　2025年7月1日

    出版者・発行元： Springer Science and Business Media LLC

    DOI： 10.1038/s41467-025-60891-2 　

    eISSN：2041-1723

  21. Nonvolatile anomalous Nernst effect in Mn5Si3 with a collinear Néel vector 査読有り

    L. Han, X.Z. Fu, W.Q. He, J.K. Dai, Y.X. Zhu, W.F. Yang, Y.L. Chen, J.C. Zhang, W.X. Zhu, H. Bai, C. Chen, D.Z. Hou, C.H. Wan, X.F. Han, C. Song, J.W. Liu, F. Pan

    Physical Review Applied　23　(4)　044066　2025年4月30日

    出版者・発行元： American Physical Society (APS)

    DOI： 10.1103/physrevapplied.23.044066 　

    eISSN：2331-7019

  22. Probing the Néel Order in Altermagnetic RuO2 Films via X-Ray Magnetic Linear Dichroism 査読有り

    Yi-Chi Zhang, Hua Bai, Dong-Hui Zhang, Chong Chen, Lei Han, Shi-Xuan Liang, Rui-Yue Chu, Jian-Kun Dai, Maciek Sawicki, Feng Pan, Cheng Song

    Chinese Physics Letters　42　(2)　027301　2025年3月1日

    DOI： 10.1088/0256-307X/42/2/027301 　

    ISSN：0256-307X

    eISSN：1741-3540

  23. Field-Free Perpendicular Magnetic Memory Driven by Out-of-Plane Spin-Orbit Torques 査読有り

    Shixuan Liang, Aitian Chen, Lei Han, Hua Bai, Chong Chen, Lin Huang, Mingyuan Ma, Feng Pan, Xixiang Zhang, Cheng Song

    Advanced Functional Materials　35　(12)　2417731　2024年11月19日

    出版者・発行元： Wiley

    DOI： 10.1002/adfm.202417731 　

    ISSN：1616-301X

    eISSN：1616-3028

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    Abstract Magnetic memory based on spin‐orbit torque (SOT) is a promising candidate for the next‐generation storage devices. Materials that generate out‐of‐plane spin polarization ( σ z ) are highly desired and actively pursued as the SOT generator, due to its ability to achieve field‐free SOT switching of perpendicular magnetization. However, integrating σ z into perpendicular magnetic tunnel junction for efficient data writing is not realized. Here, utilizing σ z from antiferromagnetic spin Hall effect in Mn 2 Au, σ z ‐enabled field‐free SOT switching of perpendicular magnetic tunnel junctions is realized demonstrating a magnetic memory with both writing and reading electrically. The tunnel magnetoresistance ratio achieves 66% with a critical current density of 5.6 × 10 6  A cm −2 at room temperature. Such field‐free fully SOT switching is further directly confirmed by domain imaging via magneto‐optical Kerr effect microscopy. In addition to enabling field‐free switching, σ z is proposed to assist ultrafast and more efficient switching of perpendicular magnetization compared with conventional in‐planes ones, based on simulations. This research advances the application of out‐of‐plane SOTs and paves the way for high‐density, high‐speed, and low‐power magnetic memory.

  24. Lead-Free Hybrid Perovskite: An Efficient Room-Temperature Spin Generator via Large Interfacial Rashba Effect 査読有り

    Lei Han, Qian Wang, Ying Lu, Sheng Tao, Wenxuan Zhu, Xiaoyu Feng, Shixuan Liang, Hua Bai, Chong Chen, Kai Wang, Zhou Yang, Xiaolong Fan, Cheng Song, Feng Pan

    ACS Nano　18　(44)　30616-30625　2024年10月21日

    出版者・発行元： American Chemical Society (ACS)

    DOI： 10.1021/acsnano.4c09413 　

    ISSN：1936-0851

    eISSN：1936-086X

  25. Terahertz oscillation driven by optical spin-orbit torque 査読有り

    Lin Huang, Yanzhang Cao, Hongsong Qiu, Hua Bai, Liyang Liao, Chong Chen, Lei Han, Feng Pan, Biaobing Jin, Cheng Song

    Nature Communications　15　(1)　7227　2024年8月22日

    出版者・発行元： Springer Science and Business Media LLC

    DOI： 10.1038/s41467-024-51440-4 　

    eISSN：2041-1723

  26. Simultaneous High Charge-Spin Conversion Efficiency and Large Spin Diffusion Length in Altermagnetic RuO2 査読有り

    Yichi Zhang, Hua Bai, Lei Han, Chong Chen, Yongjian Zhou, Christian H. Back, Feng Pan, Yuyan Wang, Cheng Song

    Advanced Functional Materials　34　(24)　2313332　2024年6月

    DOI： 10.1002/adfm.202313332 　

    ISSN：1616-301X

    eISSN：1616-3028

  27. Electrical 180° switching of Néel vector in spin-splitting antiferromagnet 査読有り

    Lei Han, Xizhi Fu, Rui Peng, Xingkai Cheng, Jiankun Dai, Liangyang Liu, Yidian Li, Yichi Zhang, Wenxuan Zhu, Hua Bai, Yongjian Zhou, Shixuan Liang, Chong Chen, Qian Wang, Xianzhe Chen, Luyi Yang, Yang Zhang, Cheng Song, Junwei Liu, Feng Pan

    Science Advances　10　(4)　eadn0479　2024年1月26日

    DOI： 10.1126/sciadv.adn0479 　

    ISSN：2375-2548

  28. Spin-torque-driven antiferromagnetic resonance 査読有り

    Yongjian Zhou, Tingwen Guo, Lei Han, Liyang Liao, Wenqing He, Caihua Wan, Chong Chen, Qian Wang, Leilei Qiao, Hua Bai, Wenxuan Zhu, Yichi Zhang, Ruyi Chen, Xiufeng Han, Feng Pan, Cheng Song

    Science Advances　10　(2)　eadk7935　2024年1月12日

    DOI： 10.1126/sciadv.adk7935 　

    ISSN：2375-2548

  29. Interface-enhanced room-temperature Curie temperature in CrPS4/graphene van der Waals heterostructure 査読有り

    Wenxuan Zhu, Cheng Song, Lei Han, Hua Bai, Chong Chen, Feng Pan

    Physical Review B　108　(10)　L100406　2023年9月26日

    DOI： 10.1103/PhysRevB.108.L100406 　

    ISSN：2469-9950

    eISSN：2469-9969

  30. Antiferromagnetic Inverse Spin Hall Effect 査読有り

    Lin Huang, Yongjian Zhou, Hongsong Qiu, Hua Bai, Chong Chen, Weichao Yu, Liyang Liao, Tingwen Guo, Feng Pan, Biaobing Jin, Cheng Song

    Advanced Materials　34　(42)　2205988　2022年10月

    DOI： 10.1002/adma.202205988 　

    ISSN：0935-9648

    eISSN：1521-4095

  31. Spin homojunction with high interfacial transparency for efficient spin-charge conversion 査読有り

    Lei Han, Yuyan Wang, Wenxuan Zhu, Runni Zhao, Xianzhe Chen, Rongxuan Su, Yongjian Zhou, Hua Bai, Qian Wang, Yunfeng You, Chong Chen, Sen Yan, Tongjin Chen, Yongzheng Wen, Cheng Song, Feng Pan

    Science Advances　8　(38)　eabq2742　2022年9月23日

    出版者・発行元： American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/sciadv.abq2742 　

    eISSN：2375-2548

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    High interfacial transparency is vital to achieve efficient spin-charge conversion for ideal spintronic devices with low energy consumption. However, in traditional ferromagnetic/nonmagnetic heterojunctions, the interfacial Rashba spin-orbit coupling brings about spin memory loss (SML) and two-magnon scattering (TMS), quenching spin current crossing the heterointerfaces. To address the intrinsic deficiency of heterointerface, we design a ferromagnetic FeRh/antiferromagnetic FeRh spin homojunction for efficient spin-charge conversion, verified by a high interfacial transparency of 0.75 and a high spin torque efficiency of 0.34 from spin pumping measurements. First-principles calculations demonstrate that the interfacial electric field of homojunction is two orders of magnitude smaller than that of traditional heterojunction, producing negligible interfacial spin-orbit coupling to drastically reduce SML and TMS. Our spin homojunction exhibits potential and enlightenment for future energy-efficient spintronic devices.

  32. Orthogonal interlayer coupling in an all-antiferromagnetic junction 査読有り

    Yongjian Zhou, Liyang Liao, Tingwen Guo, Hua Bai, Mingkun Zhao, Caihua Wan, Lin Huang, Lei Han, Leilei Qiao, Yunfeng You, Chong Chen, Ruyi Chen, Zhiyuan Zhou, Xiufeng Han, Feng Pan, Cheng Song

    Nature Communications　13　(1)　3723　2022年6月28日

    出版者・発行元： Springer Science and Business Media LLC

    DOI： 10.1038/s41467-022-31531-w 　

    eISSN：2041-1723

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    Abstract In conventional ferromagnet/spacer/ferromagnet sandwiches, noncollinear couplings are commonly absent because of the low coupling energy and strong magnetization. For antiferromagnets (AFM), the small net moment can embody a low coupling energy as a sizable coupling field, however, such AFM sandwich structures have been scarcely explored. Here we demonstrate orthogonal interlayer coupling at room temperature in an all-antiferromagnetic junction Fe 2 O 3 /Cr 2 O 3 /Fe 2 O 3 , where the Néel vectors in the top and bottom Fe 2 O 3 layers are strongly orthogonally coupled and the coupling strength is significantly affected by the thickness of the antiferromagnetic Cr 2 O 3 spacer. From the energy and symmetry analysis, the direct coupling via uniform magnetic ordering in Cr 2 O 3 spacer in our junction is excluded. The coupling is proposed to be mediated by the non-uniform domain wall state in the spacer. The strong long-range coupling in an antiferromagnetic junction provides an unexplored approach for designing antiferromagnetic structures and makes it a promising building block for antiferromagnetic devices.

  33. Observation of negative capacitance in antiferroelectric PbZrO3 Films 査読有り

    Leilei Qiao, Cheng Song, Yiming Sun, Muhammad Umer Fayaz, Tianqi Lu, Siqi Yin, Chong Chen, Huiping Xu, Tian-Ling Ren, Feng Pan

    Nature Communications　12　(1)　4215　2021年7月9日

    出版者・発行元： Springer Science and Business Media LLC

    DOI： 10.1038/s41467-021-24530-w 　

    eISSN：2041-1723

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    Abstract Negative capacitance effect in ferroelectric materials provides a solution to the energy dissipation problem induced by Boltzmann distribution of electrons in conventional electronics. Here, we discover that besides ferroelectrics, the antiferroelectrics based on Landau switches also have intrinsic negative capacitance effect. We report both the static and transient negative capacitance effect in antiferroelectric PbZrO3 films and reveal its possible physical origin. The capacitance of the capacitor of the PbZrO3 and paraelectric heterostructure is demonstrated to be larger than that of the isolated paraelectric capacitor at room temperature, indicating the existence of the static negative capacitance. The opposite variation trends of the voltage and charge transients in a circuit of the PbZrO3 capacitor in series with an external resistor demonstrate the existence of transient negative capacitance effect. Strikingly, four negative capacitance effects are observed in the antiferroelectric system during one cycle scan of voltage pulses, different from the ferroelectric counterpart with two negative capacitance effects. The polarization vector mapping, electric field and free energy analysis reveal the rich local regions of negative capacitance effect with the negative dP/dE and (δ2G)⁄(δD2), producing stronger negative capacitance effect. The observation of negative capacitance effect in antiferroelectric films significantly extends the range of its potential application and reduces the power dissipation further.

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