Size dependence in the magnetization reversal of Fe/Gd multilayers on self-assembled arrays of nanospheres

被引：14

作者：

Amaladass, E.

Ludescher, B.

Sch tz, G.

Tyliszczak, T.

Eim ller, T. ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Junior Res Grp Magnet Microscopy, D-44780 Bochum, Germany

[2] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[3] LBNL, ALS, Berkeley, CA 94720 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 17期

关键词：

Nanospheres;

D O I：

10.1063/1.2802075

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The size dependent magnetization reversal of Fe/Gd multilayers on self-assembled silica nanospheres has been studied by scanning transmission x-ray microscopy. Caps on 800 nm spherules show S-shaped hysteresis loops while the caps on 330 and 160 nm spherules exhibit rectangular loops. This drastic change is attributed to a transition from a radial to a uniaxial magnetization distribution with decreasing diameter and results from the increasing exchange interaction between adjacent moments. Furthermore, element selective studies reveal a transition from an aligned to a twisted magnetic state with reducing size of the nanocaps. (C) 2007 American Institute of Physics.

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页数：3

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