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Title: Circular single domains in hemispherical Permalloy nanoclusters

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 (∼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.
Authors:
;  [1] ;  [2] ; ; ;  [3]
  1. Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa-MG (Brazil)
  2. Centro Brasileiro de Pesquisas Físicas, 22290-180 Rio de Janeiro-RJ (Brazil)
  3. Departamento de Física, Universidade Federal de Santa Catarina, 88040-900 Florianópolis-SC (Brazil)
Publication Date:
OSTI Identifier:
22402630
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRODEPOSITION; GROUND STATES; HYSTERESIS; MAGNETIC FIELDS; MAGNETIZATION; MAGNETORESISTANCE; NANOSTRUCTURES; PERMALLOY; SILICON; SPIN; TOPOLOGY