Exchange bias in a ferromagnet/antiferromagnet system with T{sub C}<<T{sub N}
- Instituto de Fisica, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, 91501-970 Rio Grande do Sul (Brazil)
This paper reports experimental results obtained on an unconventional exchange bias (EB) system where the ferromagnetic layer, Ni{sub 0.75}Cu{sub 0.25}, has lower ordering temperature (T{sub C}) than that (T{sub N}) of the antiferromagnetic one, NiO, with emphasis on modifying EB through either magnetic annealing or light-ion irradiation. Samples were cooled from temperatures higher than T{sub N} or in between T{sub C} and T{sub N} to room temperature with magnetic field applied in different in-plane directions. Upon ion irradiation, magnetic fields, parallel or antiparallel to the orientation of the field present during the films deposition, were applied to explore different effects on EB. We found that the EB direction can be completely reversed by means of either annealing or ion bombardment; however, both postdeposition treatments provide very little variation of the EB field value over that produced during the film's growth. The importance of the annealing field strength was also discussed. The results were interpreted based on a mechanism which assumes that the interfacial moments adjacent to the antiferromagnetic layer are responsible for establishing the exchange biasing in the paramagnetic state.
- OSTI ID:
- 21560178
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 109; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ANNEALING
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
BEAMS
CHALCOGENIDES
CHARGED PARTICLES
COPPER ALLOYS
DEPOSITION
EXCHANGE INTERACTIONS
FERROMAGNETIC MATERIALS
FILMS
HEAT TREATMENTS
INTERACTIONS
INTERFACES
ION BEAMS
IONS
IRRADIATION
LAYERS
LIGHT IONS
MAGNETIC FIELDS
MAGNETIC MATERIALS
MAGNETISM
MATERIALS
NICKEL ALLOYS
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
SPUTTERING
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS