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arXiv · 2104.03517

Tailoring magnetization reversal of a single-domain bar nanomagnet via its end geometry

Jianhua Li·Sining Dong·Wen-Cheng Yue·Zixiong Yuan·Zhi-Li Xiao·Yang-Yang Lyu·Ting-Ting Wang·Chong Li·Chenguang Wang·Wen-Bing Xu·Ying Dong·Huabing Wang·Peiheng Wu·Wai-Kwong Kwok·Yong-Lei Wang
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Abstract

Nanoscale single-domain bar magnets are building blocks for a variety of fundamental and applied mesoscopic magnetic systems, such as artificial spin ices, magnetic shape-morphing microbots as well as magnetic majority logic gates. The magnetization reversal switching field of the bar nanomagnets is a crucial parameter that determines the physical properties and functionalities of their constituted artificial systems. Previous methods on tuning the magnetization reversal switching field of a bar nanomagnet usually rely on modifying its aspect ratio, such as its length, width and/or thickness. Here, we show that the switching field of a bar nanomagnet saturates when extending its length beyond a certain value, preventing further tailoring of the magnetization reversal via aspect ratios. We showcase highly tunable switching field of a bar nanomagent by tailoring its end geometry without altering its size. This provides an easy method to control the magnetization reversal of a single-domain bar nanomagnet. It would enable new research and/or applications, such as designing artificial spin ices with additional tuning parameters, engineering magnetic microbots with more flexibility as well as developing magnetic quantum-dot cellular automata systems for low power computing.

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Jianhua Li, Sining Dong, Wen-Cheng Yue, Zixiong Yuan, Zhi-Li Xiao, Yang-Yang Lyu, Ting-Ting Wang, Chong Li, Chenguang Wang, Wen-Bing Xu, Ying Dong, Huabing Wang, Peiheng Wu, Wai-Kwong Kwok, Yong-Lei Wang. 2021-04-08. Tailoring magnetization reversal of a single-domain bar nanomagnet via its end geometry. https://doi.org/10.1063/5.0041220

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