Strongly enhanced Curie temperature in carbon-doped Mn5Ge3 films

被引：76

作者：

Gajdzik, M ^{[1
]}

Sürgers, C ^{[1
]}

Kelemen, MT ^{[1
]}

Von Löhneysen, H ^{[1
]}

机构：

[1] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2000年 / 221卷 / 03期

关键词：

manganese compounds; Curie temperature; magnetic moments; carbon doping;

D O I：

10.1016/S0304-8853(00)00494-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural and magnetic properties of Mn5Ge3Cx films prepared at elevated substrate temperatures T-S are investigated. In particular, films with x greater than or equal to 0.5 and T-S = 680 K exhibit a strongly enhanced Curie temperature T-C = 445 K compared to bulk Mn5Ge3 with T-C = 304 K while at the same time the average Mn moment decreases from 2.6 to 1 mu (B). Structural analysis of these films suggests that the carbon is interstitially incorporated into the voids of Mn octahedra of the hexagonal Mn5Si3-type structure giving rise to a lattice compression. The enhanced ferromagnetic stability in connection with the lattice compression is interpreted in terms of an Mn-Mn interaction mediated by C based on a change in the electronic structure. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：248 / 254

页数：7

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