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Author Basaran, Ali C. ♦ Guénon, S. ♦ Schuller, Ivan K. ♦ Morales, R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ANISOTROPY ♦ CRYSTALLOGRAPHY ♦ DEPTH ♦ DETECTION ♦ HALL EFFECT ♦ HELICITY ♦ IRON FLUORIDES ♦ MAGNETIC FIELDS ♦ MAGNETIZATION ♦ NANOSTRUCTURES ♦ SIGNALS ♦ SIMULATION ♦ SPIN
Abstract 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.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-06-22
Publisher Place United States
Journal Applied Physics Letters
Volume Number 106
Issue Number 25


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