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

Journal Article · Sun Jun 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4921863· OSTI ID:22412888

Schafer, D.; Grande, P. L.; Pereira, L. G.; Azevedo, G. M.; Harres, A.; Geshev, J. ^[1]; Sousa, M. A. de ^[2]; Pelegrini, F. ^[2]

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1. Instituto de Física, UFRGS, Porto Alegre, 91501-970 Rio Grande do Sul (Brazil)
2. Instituto de Física, UFG, Goiânia, 74001-970 Goiás (Brazil)

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.

• OSTI ID: 22412888
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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