Transition from antiferromagnetic interlayer ordering to superparamagnetic state in Fe/Cr nanostructures by varying Fe thickness

被引：5

作者：

Ustinov, V. V. ^{[1
]}

Milyaev, M. A. ^{[1
]}

Romashev, L. N. ^{[1
]}

Korolev, A. V. ^{[1
]}

Tsurin, V. A. ^{[1
]}

Yartseva, N. S. ^{[1
]}

Yartsev, S. V. ^{[2
]}

Parlebas, J. C. ^{[3
]}

机构：

[1] RAS, Inst Met Phys UD, Ekaterinburg 620041, Russia

[2] ZAO NPO Spektr, Berezovskiy 623700, Sverdlovskaya O, Russia

[3] CNRS UDS, UMR 7504, Inst Phys & Chim Mat Strasbourg, F-67034 Strasbourg 2, France

来源：

EUROPEAN PHYSICAL JOURNAL B | 2010年 / 74卷 / 04期

关键词：

MAGNETIC-MOMENTS; INTERFACE; MULTILAYERS; REDUCTION; SURFACE; LAYERS;

D O I：

10.1140/epjb/e2010-00118-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Transition from antiferromagnetic exchange coupling of the Fe layers to superparamagnetic state of the Fe/Cr nanostructures is studied experimentally and theoretically. The experimental study are performed by means of magnetoresistance and magnetization measurements as well as Mossbauer spectroscopy for the nanostructures with Fe layers thicknesses from 1.4 up to 16 alternating by 10 of Cr layers. It is shown that Fe layers in the nanostructures with thicknesses less than 2 are not continuous but consist of separate ferromagnetic clusters. Such cluster-layered nanostructures exhibit Langevin paramagnetism of the superparamagnetic clusters and the Kondo-like behavior of the resistance. For the considered nanostructures, a modeling of Fe and Cr atoms random deposition for the interface layers and self-consistent calculations of the magnetic moments distribution in Periodic Anderson model are carried out. It is shown that, for nanostructures with extremely thin Fe layers, the Fe clusters with lateral size in the range of 11 to 20 are self-organized. Calculations of magnetic moments distribution result in histograms which coincide with the hyperfine field distributions obtained by Mossbauer spectroscopy.

引用

页码：467 / 474

页数：8

共 19 条

[1]

Almokhtar M, 2002, PHYS REV B, V66, DOI 10.1103/PhysRevB.66.134401

[2]

Bagrets NV, 2003, PHYS MET METALLOGR+, V96, P80

[3] Surface alloy formation of Fe on Cr(100) studied by scanning tunneling microscopy [J].