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Title: Detection of in-depth helical spin structures by planar Hall effect

We developed a method to determine the magnetic helicity and to study reversal mechanisms in exchange biased nanostructures using Planar Hall Effect (PHE). As a test case, we use an in-depth helical spin configuration that occurs during magnetization reversal in exchange coupled Ni/FeF{sub 2} heterostructures. We show the way to induce and determine the sign of the helicity from PHE measurements on a lithographically patterned cross. The helicity sign can be controlled by the angle between the externally applied magnetic field and a well-defined unidirectional anisotropy axis. Furthermore, the PHE signal reveals complex reversal features due to small deviations of the local unidirectional anisotropy axes from the crystallographic easy axis. The simulations using an incomplete domain wall model are in excellent agreement with the experimental data. These studies show that helical spin formations in nanomagnetic systems can be studied using laboratory-based magnetotransport.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, California 92093 (United States)
  2. Department of Chemical-Physics & BCMaterials, University of the Basque Country UPV/EHU, Leioa 48940 (Spain)
  3. (Spain)
Publication Date:
OSTI Identifier:
22482014
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 25; Other Information: (c) 2015 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; ANISOTROPY; CRYSTALLOGRAPHY; DEPTH; DETECTION; HALL EFFECT; HELICITY; IRON FLUORIDES; MAGNETIC FIELDS; MAGNETIZATION; NANOSTRUCTURES; SIGNALS; SIMULATION; SPIN