High-coercivity magnetism in nanostructures with strong easy-plane anisotropy

被引：24

作者：

Balasubramanian, Balamurugan ^{[1
,2
]}

Manchanda, Priyanka ^{[1
,2
]}

Skomski, Ralph ^{[1
,2
]}

Mukherjee, Pinaki ^{[1
,2
]}

Valloppilly, Shah R. ^{[1
]}

Das, Bhaskar ^{[1
,2
]}

Hadjipanayis, George C. ^{[3
]}

Sellmyer, David J. ^{[1
,2
]}

机构：

[1] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

[2] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[3] Univ Delaware, Dept Phys & Astron, Newark, DC 19716 USA

来源：

APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 15期

基金：

美国国家科学基金会;

关键词：

Anisotropy - Nanoparticles - Quantum theory - Silicon compounds - Density functional theory - Coercive force - Nanomagnetics - Permanent magnets;

D O I：

10.1063/1.4945987

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the fabrication of a rare-earth-free permanent-magnet material Co3Si in the form of nanoparticles and investigate its magnetic properties by experiments and density-functional theory (DFT). The DFT calculations show that bulk Co3Si has an easy-plane anisotropy with a high K-1 approximate to-64 Merg/cm(3) (-6.4 MJ/m(3)) and magnetic polarization of 9.2 kG (0.92 T). In spite of having a negative anisotropy that generally leads to negligibly low coercivities in bulk crystals, Co3Si nanoparticles exhibit high coercivities (17.4 kOe at 10K and 4.3 kOe at 300 K). This result is a consequence of the unique nanostructure made possible by an effective easy-axis alignment in the cluster-deposition method and explained using micromagnetic analysis as a nanoscale phenomenon involving quantum-mechanical exchange interactions. (C) 2016 AIP Publishing LLC.

引用

页数：4

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