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Chen C, Liu P, Liang S, Zhang Y, Zhu W, Han L, Wang Q, Fu S, Pan F, Song C. Electrical Detection of Acoustic Antiferromagnetic Resonance in Compensated Synthetic Antiferromagnets. PHYSICAL REVIEW LETTERS 2024; 133:056702. [PMID: 39159109 DOI: 10.1103/physrevlett.133.056702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 04/06/2024] [Accepted: 06/26/2024] [Indexed: 08/21/2024]
Abstract
Compensated synthetic antiferromagnets (SAFs) stand out as promising candidates to explore various spintronic applications, benefitting from high precession frequency and negligible stray field. High-frequency antiferromagnetic resonance in SAFs, especially the optic mode (OM), is highly desired to attain fast operation speed in antiferromagnetic spintronic devices. SAFs exhibit ferromagnetic configurations above saturation field; however in that case, the intensity of OM is theoretically zero and hard to be detected in well-established microwave resonance experiments. To expose the hidden OM, the exchange symmetry between magnetic layers must be broken, inevitably introducing remanent magnetization. Here, we experimentally demonstrate a feasible method to break the symmetry via surface acoustic waves with the maintenance of compensated SAF structure. By introducing an out-of-plane strain gradient inside the Ir-mediated SAFs, we successfully reveal the hidden OM. Remarkably, the OM intensity can be effectively modulated by controlling strain gradients in SAFs with different thicknesses, confirmed by finite-element simulations. Our findings provide a feasible scheme for detecting the concealed OM, which would trigger future discoveries in magnon-phonon coupling and hybrid quasiparticle systems.
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Affiliation(s)
| | | | | | | | | | - Lei Han
- Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Liao L, Chen F, Puebla J, Kishine JI, Kondou K, Luo W, Zhao D, Zhang Y, Ba Y, Otani Y. Nonreciprocal magnetoacoustic waves with out-of-plane phononic angular momenta. SCIENCE ADVANCES 2024; 10:eado2504. [PMID: 38985868 PMCID: PMC11235162 DOI: 10.1126/sciadv.ado2504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 06/04/2024] [Indexed: 07/12/2024]
Abstract
Surface acoustic wave (SAW) can carry phononic angular momentum, showing great potential as an energy-efficient way to control magnetism. Still, out-of-plane phononic angular momentum in SAW and its interaction with magnetism remain elusive. Here, we studied the SAW-induced magnetoacoustic waves and spin pumping in Ni-based films on LiNbO3 with selected SAW propagation direction. The crystal inversion asymmetry induces circularly polarized phonons with large out-of-plane angular momenta so that up to 60% of the SAW power attenuates nonreciprocally controlled by the out-of-plane magnetization component. The SAW propagation direction dependence of the nonreciprocity verifies the crystal origin of the phononic angular momentum, and a chiral spin pumping demonstrates that the circular polarization can control the spin current generation efficiency. These results provide an additional degree of freedom for the acoustic control of magnetism and open an avenue for applying circularly polarized phonons.
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Affiliation(s)
- Liyang Liao
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Fa Chen
- School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jorge Puebla
- Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan
| | - Jun-ichiro Kishine
- The Open University of Japan, Chiba 261-0013, Japan
- Quantum Research Center for Chirality, Institute for Molecular Science, Aichi 444-8585, Japan
| | - Kouta Kondou
- Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan
| | - Wei Luo
- School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Degang Zhao
- School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Yue Zhang
- School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - You Ba
- Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan
| | - Yoshichika Otani
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan
- Trans-scale Quantum Science Institute, University of Tokyo, Tokyo 113-8654, Japan
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Cao Y, Ding H, Zuo Y, Li X, Zhao Y, Li T, Lei N, Cao J, Si M, Xi L, Jia C, Xue D, Yang D. Acoustic spin rotation in heavy-metal-ferromagnet bilayers. Nat Commun 2024; 15:1013. [PMID: 38307850 PMCID: PMC10837457 DOI: 10.1038/s41467-024-45317-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 01/19/2024] [Indexed: 02/04/2024] Open
Abstract
Through pumping a spin current from ferromagnet into heavy metal (HM) via magnetization precession, parts of the injected spins are in-plane rotated by the lattice vibration, namely acoustic spin rotation (ASR), which manifests itself as an inverse spin Hall voltage in HM with an additional 90° difference in angular dependency. When reversing the stacking order of bilayer with a counter-propagating spin current or using HMs with an opposite spin Hall angle, such ASR voltage shows the same sign, strongly suggesting that ASR changes the rotation direction due to interface spin-orbit interaction. With the drift-diffusion model of spin transport, we quantify the efficiency of ASR up to 30%. The finding of ASR endows the acoustic device with an ability to manipulate spin, and further reveals a new spin-orbit coupling between spin current and lattice vibration.
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Affiliation(s)
- Yang Cao
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Hao Ding
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Yalu Zuo
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Xiling Li
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Yibing Zhao
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Tong Li
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Na Lei
- Fert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing, 100191, China
| | - Jiangwei Cao
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Mingsu Si
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Li Xi
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Chenglong Jia
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China
| | - Desheng Xue
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China.
| | - Dezheng Yang
- Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, China.
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