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Title: Manipulation by exchange coupling in layered magnetic structures

Exchange coupling in magnetic heterostructures can be modified via introduction of additional magnetic spacer layers at the interfaces. The magnetic characteristics and the spacer layer thickness determine the functional properties of the whole system. We show that the hysteresis loop area of trilayer spring magnets with two different soft magnetic layers (s1, s2) and one hard magnetic layer (h) with the sequence s1/s2/h can be increased as compared to both bilayer structures s1/h and s2/h with the same total thickness of the soft layers and for definite thickness ratios of the soft layers and their sequences. For ferrimagnetic spin valves, the perpendicular exchange bias effect can be tuned via the thickness of non-magnetic spacer layers at the interface, which determine the exchange coupling between ferrimagnets. A simple quasi one-dimensional phenomenological model is able to describe the magnetic hysteresis of even complex layered structures and to predict optimal geometrical and magnetic parameters of such heterostructures.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. St. Petersburg National Research University of Information Technologies, Mechanics and Optics, St. Petersburg 197101 (Russian Federation)
  2. (Iceland)
  3. (Russian Federation)
  4. Department of Physics and Astronomy, Ruhr-University Bochum, 44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
22278105
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; COUPLING; FERRIMAGNETIC MATERIALS; FERRIMAGNETISM; HETEROJUNCTIONS; HYSTERESIS; INTERFACES; LAYERS; MAGNETS; SPIN; THICKNESS