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Title: Optimization of L1{sub 0} FePt/Fe{sub 45}Co{sub 55} thin films for rare earth free permanent magnet applications

The magnetic properties of magnetron sputtered bilayers consisting of Fe{sub 45}Co{sub 55} ultrathin layers on top of L1{sub 0} FePt films epitaxially grown on MgO substrates are studied in view of their possible application as rare earth free permanent magnets. It is found that FePt layers induce a tetragonal distortion to the Fe-Co layers which leads to increased anisotropy. This allows to take advantage of the Fe-Co high magnetic moment with less significant loss of the coercivity compared to a typical hard/soft exchange spring system. A maximum energy product approaching 50 MGOe is obtained for a FePt(7 ML)/FeCo/(5 ML) sample. The results are in accordance with first-principles computational methods, which predict that even higher energy products are possible for micromagnetically optimized microstructures.
Authors:
; ;  [1] ;  [2] ;  [3] ; ;  [4] ; ;  [2] ; ;  [5]
  1. INN, NCSR Demokritos, Athens 15310 (Greece)
  2. IFW Dresden, P.O. Box 270116, 01171 Dresden (Germany)
  3. (Germany)
  4. Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110 (Greece)
  5. Department of Physics, Pukyong National University, Busan 608-737 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22412916
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 22; Other Information: (c) 2015 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; ANISOTROPY; COBALT; COERCIVE FORCE; COMPARATIVE EVALUATIONS; CRYSTAL GROWTH; EPITAXY; INTERMETALLIC COMPOUNDS; IRON; LAYERS; MAGNESIUM OXIDES; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MICROSTRUCTURE; OPTIMIZATION; PERMANENT MAGNETS; SPUTTERING; SUBSTRATES; THIN FILMS