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Title: Increased magnetocrystalline anisotropy in epitaxial Fe-Co-C thin films with spontaneous strain

Rare earth free alloys are in focus of permanent magnet research since the accessibility of the elements needed for nowadays conventional magnets is limited. Tetragonally strained iron-cobalt (Fe-Co) has attracted large interest as promising candidate due to theoretical calculations. In experiments, however, the applied strain quickly relaxes with increasing film thickness and hampers stabilization of a strong magnetocrystalline anisotropy. In our study, we show that already 2 at. % of carbon substantially reduces the lattice relaxation leading to the formation of a spontaneously strained phase with 3% tetragonal distortion. In these strained (Fe{sub 0.4}Co{sub 0.6}){sub 0.98}C{sub 0.02} films, a magnetocrystalline anisotropy above 0.4 MJ/m{sup 3} is observed while the large polarization of 2.1 T is maintained. Compared to binary Fe-Co, this is a remarkable improvement of the intrinsic magnetic properties. In this paper, we relate our experimental work to theoretical studies of strained Fe-Co-C and find a very good agreement.
Authors:
; ;  [1] ;  [2] ; ;  [3] ; ; ; ;  [1] ; ;  [4]
  1. IFW Dresden, P.O. Box 270116, 01171 Dresden (Germany)
  2. (Germany)
  3. Demokritos National Center of Scientific Research, 15310 Athens (Greece)
  4. Uppsala University, Department of Physics and Astronomy, 75120 Uppsala (Sweden)
Publication Date:
OSTI Identifier:
22402721
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALLOYS; ANISOTROPY; CARBON; COBALT; EPITAXY; IRON; MAGNETIC PROPERTIES; PERMANENT MAGNETS; POLARIZATION; RARE EARTHS; RELAXATION; STABILIZATION; STRAINS; THICKNESS; THIN FILMS