Magnetic and Structural Properties of Rapidly Quenched Tetragonal Mn3-xGa Nanostructures

被引：38

作者：

Huh, Y. ^{[1
,2
]}

Kharel, P. ^{[1
,3
]}

Shah, V. R. ^{[1
]}

Krage, E. ^{[1
,2
]}

Skomski, R. ^{[1
,3
]}

Shield, J. E. ^{[1
,4
]}

Sellmyer, D. J. ^{[1
,3
]}

机构：

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

[2] S Dakota State Univ, Dept Phys, Brookings, SD 57007 USA

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

[4] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2013年 / 49卷 / 07期

关键词：

Magnetic anisotropy; melt-spun ribbons; permanent magnet; spintronic device; ANISOTROPY;

D O I：

10.1109/TMAG.2013.2244856

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Nanostructured Mn3-x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D0(19) and cubic L2(1) Heusler crystal structures based on the concentration of Mn in Mn3-xGa. Upon vacuum-annealing the samples at 450 degrees C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D0(22) structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn-1.9 Ga and Mn-2.1 Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn-2.6 Ga and Mn-3.0 Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3-x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn-2.6 Ga and Mn-3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3-x Ga. The maximum magnetization of 57 emu/g (300 emu/cm(3)) and the coercivity of 6.5 kOe were measured in the Mn-1.9 Ga and Mn-3.0 Ga ribbons, respectively.

引用

页码：3277 / 3280

页数：4

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