We study the effect of atomic interdiffusion on the exchange bias of polycrystalline IrMn/(57Fe + CoFe) multilayers due to the thermal setting process of exchange coupling during field annealing. Depth-resolved 57Fe conversion electron Mössbauer spectroscopy was used to quantify atomic interdiffusion. Vibrating sample magnetometry was used to monitor the variation of exchange bias and magnetisation. It was found that interface sharpness is only affected above ∼350 °C. Three different stages for the setting of exchange bias can be inferred from our results. At the lower setting temperatures (up to 350 °C), the effect of field annealing involves alignment of spins and interfacial coupling due to the setting of both antiferromagnetic (AF) bulk and interface without significant interdiffusion. At a second stage (350–450 °C), where AF ordering dominates over diffusion effects, atomic migration and increased setting of AF spins co-exist to produce a peak in exchange bias field and coercivity. On a third stage (>450 °C), severe chemical intermixing reduces significantly the F/AF coupling.
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7 May 2013
PROCEEDINGS OF THE 55TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS
14-18 November 2010
Atlanta, Georgia
Research Article|
Magnetism and Magnetic Materials|
March 13 2013
Setting temperature effect in polycrystalline exchange-biased IrMn/CoFe bilayers
L. E. Fernandez-Outon;
L. E. Fernandez-Outon
a)
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear
, 31270-901 Belo Horizonte, MG, Brazil
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M. S. Araújo Filho;
M. S. Araújo Filho
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear
, 31270-901 Belo Horizonte, MG, Brazil
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R. E. Araújo;
R. E. Araújo
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear
, 31270-901 Belo Horizonte, MG, Brazil
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J. D. Ardisson;
J. D. Ardisson
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear
, 31270-901 Belo Horizonte, MG, Brazil
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W. A. A. Macedo
W. A. A. Macedo
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear
, 31270-901 Belo Horizonte, MG, Brazil
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L. E. Fernandez-Outon
a)
M. S. Araújo Filho
R. E. Araújo
J. D. Ardisson
W. A. A. Macedo
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear
, 31270-901 Belo Horizonte, MG, Brazil
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Appl. Phys. 113, 17D704 (2013)
Article history
Received:
November 08 2012
Accepted:
December 03 2012
Citation
L. E. Fernandez-Outon, M. S. Araújo Filho, R. E. Araújo, J. D. Ardisson, W. A. A. Macedo; Setting temperature effect in polycrystalline exchange-biased IrMn/CoFe bilayers. J. Appl. Phys. 7 May 2013; 113 (17): 17D704. https://doi.org/10.1063/1.4795211
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