Low magnetic damping for equiatomic CoFeMnSi Heusler alloy

被引：24

作者：

Bainsla, L. ^{[1
]}

Yilgin, R. ^{[1
]}

Tsujikawa, M. ^{[2
,3
]}

Suzuki, K. Z. ^{[1
,3
]}

Shirai, M. ^{[2
,3
,4
]}

Mizukami, S. ^{[1
,3
,4
]}

机构：

[1] Tohoku Univ, WPI Adv Inst Mat Res, 1-1 Katahira, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Res Inst Elect Commun, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Ctr Spintron Res Network, Sendai, Miyagi 9808577, Japan

[4] Tohoku Univ, Ctr Sci & Innovat Spintron, Org Adv Studies, Core Res Cluster, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2018年 / 51卷 / 49期

关键词：

Hensler alloys; Gilbert damping; magnetization dynamics; thin films; magnetic properties; spin-gapless semiconductor; spintronics; RESONANCE; FILMS;

D O I：

10.1088/1361-6463/aae4ef

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetic materials with low Gilbert damping and low magnetization are necessary for the realization of faster or more energy-efficient spintronic devices based on spin-transfer-torque. Here, we report Gilbert damping in epitaxially grown equiatomic quaternary CoFeMnSi Heusler alloy films. The 10 nm-thick films show a saturation magnetization of Ms = 630 emu cm(-3) and a Gilbert damping constant of alpha = 2.7 x 10(-3), which are relatively small values among transition metal ferromagnets, in addition to its soft magnetic properties. The physical origin of the relatively low damping and the possibility of a further reduction of a to the ultra-low damping regime similar to 10(-4) are discussed in terms of the spin-gapless-like electronic structure and the effect of the chemical order computed from first principles.

引用

页数：7

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