DataVXAdvanced MaterialsPaper
journal article·2020-12Open access

Magnetic‐Pole Flip by Millimeter Wave

Shin‐ichi Ohkoshi, Marie Yoshikiyo, Kenta Imoto, Kosuke Nakagawa, Asuka Namai, Hiroko Tokoro, Yuji Yahagi, Kyohei Takeuchi, Fangda Jia, Seiji Miyashita, Makoto Nakajima, Hongsong Qiu, Kosaku Kato, Takehiro Yamaoka, Masashi Shirata, Kenji Naoi, Koichi Yagishita, Hiroaki Doshita

Advanced Materials· Volume 32· Issue 48
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Source abstract

Abstract

Abstract In the era of Big Data and the Internet of Things, data archiving is a key technology. From this viewpoint, magnetic recordings are drawing attention because they guarantee long‐term data storage. To archive an enormous amount of data, further increase of the recording density is necessary. Herein a new magnetic recording methodology, “focused‐millimeter‐wave‐assisted magnetic recording (F‐MIMR),” is proposed. To test this methodology, magnetic films based on epsilon iron oxide nanoparticles are prepared and a focused‐millimeter‐wave generator is constructed using terahertz (THz) light. Irradiating the focused millimeter wave to epsilon iron oxide instantly switches its magnetic pole direction. The spin dynamics of F‐MIMR are also calculated using the stochastic Landau–Lifshitz–Gilbert model considering all of the spins in an epsilon iron oxide nanoparticle. In F‐MIMR, the heat‐up effect of the recording media is expected to be suppressed. Thus, F‐MIMR can be applied to high‐density magnetic recordings.
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Research context

Nanomaterials

OpenAlex topics: Magnetic properties of thin films · Metamaterials and Metasurfaces Applications · Quantum and electron transport phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry School of Science The University of Tokyo 7‐3‐1 Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan

Department of Materials Science Faculty of Pure and Applied Sciences University of Tsukuba 1‐1‐1 Tennodai Tsukuba Ibaraki 305–8577 Japan

Department of Physics School of Science The University of Tokyo 7‐3‐1 Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan

Institute of Laser Engineering Osaka University 2‐6 Yamadaoka Suita Osaka 565–0871 Japan

Analysis Systems Solution Development Dept. Metrology and Analysis Systems Product Div. Hitachi High‐Tech Corporation 3‐2‐1 Sakado, Takatsu‐ku Kawasaki Kanagawa 213‐0012 Japan

Recording Media Research & Development Laboratories FUJIFILM Corporation 12‐1, Ohgi‐cho 2‐Chome Odawara‐shi Kanagawa 250‐0001 Japan

Funding

New Energy and Industrial Technology Development Organization · Japan Society for the Promotion of Science · Ministry of Education, Culture, Sports, Science and Technology

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