Tuning exchange bias and coercive fields in ferromagnet/antiferromagnet bilayers with ion irradiation

被引:39
作者
Juraszek, J
Fassbender, J
Poppe, S
Mewes, T
Hillebrands, B
Engel, D
Kronenberger, A
Ehresmann, A
Schmoranzer, H
机构
[1] Univ Kaiserslautern, Fachbereich Phys, D-67663 Kaiserslautern, Germany
[2] Univ Kaiserslautern, Forsch & Entwicklingschwerpunkt Mat Wissensch, D-67663 Kaiserslautern, Germany
关键词
D O I
10.1063/1.1447187
中图分类号
O59 [应用物理学];
学科分类号
摘要
The effect of He ion irradiation on the magnetic properties of NiFe exchange coupled to different antiferromagnetic alloys (FeMn, CrMn, and PtMn) with the same layer thickness is investigated. All systems exhibit an enhanced coercivity prior to irradiation. An exchange bias field is only observed for FeMn and PtMn. Upon ion irradiation the FeMn-based system shows with increasing ion dose an enhancement followed by a decrease and finally a full suppression of the exchange bias field. For systems exchange coupled to PtMn only a decrease and suppression of the bias field is found. This can be attributed to the ion induced chemical disordering of the antiferromagnetic phase in the latter case. In the case of CrMn the antiferromagnetic layer thickness is too small to induce an exchange bias field, but an enhanced coercivity is observed which is caused by the exchange coupling between the antiferromagnetic and ferromagnetic layers. For all systems, this enhanced coercivity of the exchange coupled bilayer system is modified by ion irradiation. (C) 2002 American Institute of Physics.
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页码:6896 / 6898
页数:3
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