Mingming Tian, Qian Chen, Meiyang Ma, Wei Jiang, Qingjie Guo, Ruobai Liu, Jun Du, Xuezhong Ruan, Zhongming Zeng, Juan-Carlos Rojas-Sánchez, Stéphane Mangin, Zhaocong Huang, Yongbing Xu, Ya Zhai
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引用次数: 0
Abstract
Spin transmission is critical for the functionality of logic circuits, magnetic random-access memories, and magnetic sensors. Rare earth (RE) metals, which are promising candidates for tuning spin transmission, can form antiferromagnetically coupled interfaces with ferromagnetic layers. In this study, we investigate the laser-induced ultrafast spin injection from permalloy (Py) into the RE metal holmium (Ho), modulated by interfacial engineering and varying the external magnetic field strength. The antiferromagnetically coupled interface between Py and Ho is confirmed by x-ray magnetic circular dichroism, and its correlation with spin dynamic damping is revealed by time-resolved magneto-optical Kerr effect. More importantly, we demonstrate the effective modulation of spin transmission through an external magnetic field. At the Py/Ho interface, a substantial spin-mixing conductance (SMC) of approximately 7.71 × 1015 cm−2 is observed, which can be modulated by approximately 35% under an external magnetic field. The applied high magnetic fields are found to suppress the large SMC, primarily due to the modified sperimagnetic structure at the Py/Ho interface. These findings demonstrate the excellent spin transmission efficiency in the Py/Ho system, providing a promising approach for magneto-dynamics modulation in spintronic devices.
期刊介绍：
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field.
Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.
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