Time-resolved imaging of an operating hard-disk-drive write head using nano-beam x-ray magnetic circular dichroism

Hirofumi Suto, Akira Kikitsu, Yoshinori Kotani, Tomoyuki Maeda, Kentaro Toyoki, Hitoshi Osawa, Nobuaki Kikuchi, Satoshi Okamoto, Tetsuya Nakamura

研究成果: Article査読

抄録

We studied the dynamic magnetization behavior of a hard-disk-drive (HDD) write head by using nano-beam x-ray magnetic circular dichroism (XMCD). The write head was operated by applying a square-wave write current with a frequency of 211.9 MHz to the coil of the write head, which was in synchronization with the fivefold frequency of the x-ray pulses. Snapshot images of the magnetization on the air-bearing surface of the write head were obtained with spatial and time resolutions of 100 nm and 50 ps, respectively, and temporal changes in the magnetization of the main pole and the shield were observed. When a square-wave write current with a transition time of 0.2 ns was applied, the magnetization reversal of the main pole was completed in 0.7 ns, and this reversal time was determined by the dynamic property of the write head. During the main pole reversal, the shield area showed spatially non-uniform magnetization patterns, and its response was slower than that of the main pole. These results show that the XMCD measurement setup developed in this study is a powerful tool for understanding the dynamic behavior of an HDD write head and contributes to the development of higher capacity HDDs.

本文言語English
論文番号133903
ジャーナルJournal of Applied Physics
128
13
DOI
出版ステータスPublished - 2020 10 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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