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Title: Magnetoresistance effects and spin-valve like behavior of an arrangement of two MnAs nanoclusters

We report on magnetotransport measurements on a MnAs nanocluster arrangement consisting of two elongated single-domain clusters connected by a metal spacer. The arrangement was grown on GaAs(111)B-substrates by selective-area metal organic vapor phase epitaxy. Its structural properties were investigated using scanning-electron microscopy and atomic-force microscopy, while its magnetic domain structure was analyzed by magnetic-force microscopy. The magnetoresistance of the arrangement was investigated at 120‚ÄČK for two measurement geometries with the magnetic field oriented in the sample plane. For both geometries, discrete jumps of the magnetoresistance of the MnAs nanocluster arrangement were observed. These jumps can be explained by magnetic-field induced switching of the relative orientation of the magnetizations of the two clusters which affects the spin-dependent scattering in the interface region between the clusters. For a magnetic field orientation parallel to the nanoclusters' elongation direction a spin-valve like behavior was observed, showing that ferromagnetic nanoclusters may be suitable building blocks for planar magnetoelectronic devices.
Authors:
;  [1] ;  [1] ;  [2] ; ;  [3]
  1. Institute of Experimental Physics I, Justus-Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen (Germany)
  2. (Germany)
  3. Research Center for Integrated Quantum Electronics, Hokkaido University, North 13, West 8, Sapporo 060-8628 (Japan)
Publication Date:
OSTI Identifier:
22415140
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC FORCE MICROSCOPY; DOMAIN STRUCTURE; GALLIUM ARSENIDES; MAGNETIC FIELDS; MAGNETIZATION; MAGNETORESISTANCE; MANGANESE ARSENIDES; NANOSTRUCTURES; SCANNING ELECTRON MICROSCOPY; SUBSTRATES; VAPOR PHASE EPITAXY