Coercivity enhancement in Mn-Al-Cu flakes produced by surfactant-assisted milling

被引：21

作者：

Saravanan, P. ^{[1
]}

Hsu, Jen-Hwa ^{[2
]}

Vinod, V. T. P. ^{[3
]}

Cernik, Miroslav ^{[3
]}

Kamat, S. V. ^{[1
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

[2] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

[3] Tech Univ Liberec, Dept Nat Sci, Inst Nanomat Adv Technol & Innovat, Liberec 46117 1, Czech Republic

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 19期

关键词：

MAGNETIC-PROPERTIES; PERMANENT-MAGNETS; SINGLE-CRYSTAL; SUBMICRON; MECHANISM;

D O I：

10.1063/1.4935861

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We herein report the achievement of exceptionally high coercivity (H-c) values: 9.92 and 5.86 kOe at 5 and 300 K, respectively, for Mn55Al43Cu2 flakes produced by surfactant-assisted milling process without employing any heat-treatment. The use of surfactants such as oleic acid and oleylamine during milling yielded high-aspect ratio flakes for the Mn-Al-Cu alloy. Structural studies confirmed the presence of tau- and beta-phases as the major constituents in the Mn-Al-Cu flakes. The observed H-c enhancement is due to the increase in anisotropy field and structural defects, which is hypothesized to originate from the domain-wall pinning as a consequence of precipitation of fine Cu-particles present at the grain boundaries. (C) 2015 AIP Publishing LLC.

引用

页数：5

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