Annealing effect on thermal stability and microstructure in IrMn/Co60Fe20B20 bilayers

Gonzalo Vallejo Fernandez; T. Dimopoulos; M. Ruehrig; K. O'Grady

doi:10.1016/j.jmmm.2006.10.1145

Annealing effect on thermal stability and microstructure in IrMn/Co60Fe20B20 bilayers

Gonzalo Vallejo Fernandez, T. Dimopoulos, M. Ruehrig, K. O'Grady

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

In this work we present a systematic study on the variation of the magnetic properties and thermal stability of IrMn/CoFeB bilayers as a function of the post-deposition annealing temperature Tann. Both the exchange field and the blocking temperature increase linearly with Tann. This is attributed to an increase in the energy barrier in the antiferromagnetic grains which may be due to an increase in grain size or improved crystallinity, that takes place during annealing. However, the coercivity drops dramatically above T-ann > 300 degrees C indicating different origins for the uniaxial and unidirectional anisotropies. (C) 2006 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	E769-E771
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.1145
Publication status	Published - Mar 2007

Keywords

annealing
exchange bias
grain size
IrMn

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10.1016/j.jmmm.2006.10.1145

Cite this

@article{6364f59121a34930a5d82a805dd6c846,

title = "Annealing effect on thermal stability and microstructure in IrMn/Co60Fe20B20 bilayers",

abstract = "In this work we present a systematic study on the variation of the magnetic properties and thermal stability of IrMn/CoFeB bilayers as a function of the post-deposition annealing temperature Tann. Both the exchange field and the blocking temperature increase linearly with Tann. This is attributed to an increase in the energy barrier in the antiferromagnetic grains which may be due to an increase in grain size or improved crystallinity, that takes place during annealing. However, the coercivity drops dramatically above T-ann > 300 degrees C indicating different origins for the uniaxial and unidirectional anisotropies. (C) 2006 Elsevier B.V. All rights reserved.",

keywords = "annealing, exchange bias, grain size, IrMn",

author = "{Vallejo Fernandez}, Gonzalo and T. Dimopoulos and M. Ruehrig and K. O'Grady",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.1145",

language = "English",

volume = "310",

pages = "E769--E771",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

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}

TY - JOUR

T1 - Annealing effect on thermal stability and microstructure in IrMn/Co60Fe20B20 bilayers

AU - Vallejo Fernandez, Gonzalo

AU - Dimopoulos, T.

AU - Ruehrig, M.

AU - O'Grady, K.

PY - 2007/3

Y1 - 2007/3

N2 - In this work we present a systematic study on the variation of the magnetic properties and thermal stability of IrMn/CoFeB bilayers as a function of the post-deposition annealing temperature Tann. Both the exchange field and the blocking temperature increase linearly with Tann. This is attributed to an increase in the energy barrier in the antiferromagnetic grains which may be due to an increase in grain size or improved crystallinity, that takes place during annealing. However, the coercivity drops dramatically above T-ann > 300 degrees C indicating different origins for the uniaxial and unidirectional anisotropies. (C) 2006 Elsevier B.V. All rights reserved.

AB - In this work we present a systematic study on the variation of the magnetic properties and thermal stability of IrMn/CoFeB bilayers as a function of the post-deposition annealing temperature Tann. Both the exchange field and the blocking temperature increase linearly with Tann. This is attributed to an increase in the energy barrier in the antiferromagnetic grains which may be due to an increase in grain size or improved crystallinity, that takes place during annealing. However, the coercivity drops dramatically above T-ann > 300 degrees C indicating different origins for the uniaxial and unidirectional anisotropies. (C) 2006 Elsevier B.V. All rights reserved.

KW - annealing

KW - exchange bias

KW - grain size

KW - IrMn

U2 - 10.1016/j.jmmm.2006.10.1145

DO - 10.1016/j.jmmm.2006.10.1145

M3 - Article

SN - 0304-8853

VL - 310

SP - E769-E771

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2

ER -