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Title: Antiparallel interface coupling evidenced by negative rotatable anisotropy in IrMn/NiFe bilayers

Negative rotatable anisotropy is estimated via ferromagnetic resonance measurements in as-made, annealed, and ion-irradiated IrMn{sub 3}/Ni{sub 81}Fe{sub 19} bilayers. Opposite to previous observations, inverse correlation between rotatable anisotropy and coercivity is observed. The exchange-bias field, determined from hysteresis loop measurements, is higher than that obtained from ferromagnetic resonance for all samples. The results are discussed in terms of majority antiparallel coupling and magnetic-field-induced transitions from antiparallel to parallel states of uncompensated spins at ferromagnet/antiferromagnet interface. We affirm that an observation of negative rotatable anisotropy evidences antiparallel coupling even in systems presenting conventional exchange bias.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [2]
  1. Instituto de Física, UFRGS, Porto Alegre, 91501-970 Rio Grande do Sul (Brazil)
  2. Instituto de Física, UFG, Goiânia, 74001-970 Goiás (Brazil)
  3. (Brazil)
Publication Date:
OSTI Identifier:
22412888
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; 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; ANNEALING; COERCIVE FORCE; CORRELATIONS; COUPLING; FERROMAGNETIC RESONANCE; HYSTERESIS; INTERFACES; ION BEAMS; IRIDIUM ALLOYS; IRON ALLOYS; IRRADIATION; LAYERS; MAGNETIC FIELDS; MANGANESE BASE ALLOYS; NICKEL BASE ALLOYS; SPIN