Circular single domains in hemispherical Permalloy nanoclusters

被引：8
作者：
de Araujo, Clodoaldo I. L. [1 ]
Fonseca, Jakson M. [1 ]
Sinnecker, Joao P. [2 ]
Delatorre, Rafael G. [3 ]
Garcia, Nicolas [3 ]
Pasa, Andre A. [3 ]
机构：
[1] Univ Fed Vicosa, Dept Fis, BR-36570900 Vicosa, MG, Brazil
[2] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, RJ, Brazil
[3] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
来源：
JOURNAL OF APPLIED PHYSICS | 2014年 / 116卷 / 18期
关键词：
GIANT MAGNETORESISTANCE; WEAK FERROMAGNETISM;
D O I：
10.1063/1.4901573
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied ferromagnetic Permalloy clusters obtained by electrodeposition on n-type silicon. Magnetization measurements reveal hysteresis loops almost independent on temperature and very similar in shape to those obtained in nanodisks with diameter bigger than 150 nm. The spin configuration for the ground state, obtained by micromagnetic simulation, shows topological vortices with random chirality and polarization. This behavior in the small diameter clusters (similar to 80 nm) is attributed to the Dzyaloshinskii-Moriya interaction that arises in its hemispherical geometries. This magnetization behavior can be utilized to explain the magnetoresistance measured with magnetic field in plane and out of sample plane. (C) 2014 AIP Publishing LLC.
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页数：4
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