Realizing high magnetic moments in fcc Fe nanoparticles through atomic structure stretch

被引：15

作者：

Baker, S. H. ^{[1
]}

Roy, M. ^{[1
]}

Thornton, S. C. ^{[1
]}

Binns, C. ^{[1
]}

机构：

[1] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2012年 / 24卷 / 17期

关键词：

CENTERED-CUBIC IRON; THIN-FILMS; GADOLINIUM CLUSTERS; CO CLUSTERS; GAMMA-IRON; EXAFS DATA; BCC; NANOCLUSTERS; TRANSITION; CU(100);

D O I：

10.1088/0953-8984/24/17/176001

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 [凝聚态物理];

摘要：

We describe the realization of a high moment state in fcc Fe nanoparticles through a controlled change in their atomic structure. Embedding Fe nanoparticles in a Cu1-xAux matrix causes their atomic structure to switch from bcc to fcc. Extended x-ray absorption fine structure (EXAFS) measurements show that the structure in both the matrix and the Fe nanoparticles expands as the amount of Au in the matrix is increased, with the data indicating a tetragonal stretch in the Fe nanoparticles. The samples were prepared directly from the gas phase by co-deposition, using a gas aggregation source and MBE-type sources respectively for the nanoparticle and matrix materials. The structure change in the Fe nanoparticles is accompanied by a sharp increase in atomic magnetic moment, ultimately to values of similar to 2.5 +/- 0.3 mu(B)/atom.

引用

页数：8

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