Geometrically induced giant magnetoresistance behavior in quarter-micrometer strip pattern

K. Matsuyama, K. Matsuo, Y. Nozaki

研究成果: Conference article査読

4 被引用数 (Scopus)

抄録

The present article reports a geometrically induced magnetoresistance (MR) behavior observed in magnetic strips consisting of a symmetric layer structure with lateral sizes down to 0.2 μm. The MR ratio was markedly improved from 2.8% for an as-grown film of Co(6 nm)/Cu(6 nm)/Co(6 nm) to 4.6% by structuring it into a strip with 0.3 μm width. The parabolic MR behavior observed in the hard-axis direction suggests that the magnetization in the two magnetic layers rotates toward the opposite directions, which can be explained by the magnetostatic interaction between the surface magnetic charges at the pattern edges. The dependence of MR saturation field on the pattern width agrees well with a theoretical prediction based on a coherent rotation model. The MR ratio was markedly increased by the increase of the layer number and the thickness of the magnetic layer, the highest value of 7.8% was obtained for a strip made of [Co(6nm)/Cu(4nm)]2Co(6nm). A linear-and hysteresis-free MR response was performed with an alternative field modulation under a transverse bias field.

本文言語English
ページ(範囲)5474-5476
ページ数3
ジャーナルJournal of Applied Physics
85
8 II B
DOI
出版ステータスPublished - 1999 4月 15
外部発表はい
イベントProceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States
継続期間: 1998 11月 91998 11月 12

ASJC Scopus subject areas

  • 物理学および天文学一般

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