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Title: Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

We report on the origin of the anomalous temperature dependence of coercivity observed in some soft ferromagnets by studying the magnetic and electronic properties of FeZr films doped using ion implantation by H, He, B, C, and N. The anomalous increase of the coercivity with temperature was observed only in the C- and B-doped samples. Using x-ray photoelectron spectroscopy, we show that the anomalous behavior of the coercivity coincides with the occurrence of an electron charge transfer for those implanted samples. The origin of the anomaly is discussed in terms of (i) magnetic softness, (ii) nature of the Fe-C and -B covalent bonds, and (iii) large charge transfer.
Authors:
; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-75120 Uppsala (Sweden)
  2. Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping (Sweden)
  3. MAX IV Laboratory, Lund University, SE-22100 Lund (Sweden)
  4. KTH, School of Information and Communication Technology, Royal Institute of Technology, SE-16440 Kista-Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22314554
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; 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:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHEMICAL BONDS; COERCIVE FORCE; DOPED MATERIALS; ELECTRONS; FILMS; ION IMPLANTATION; ORIGIN; TEMPERATURE DEPENDENCE; X-RAY PHOTOELECTRON SPECTROSCOPY