Influence of crystal structure and oxygen content on exchange-coupling properties of IrMn/CoFe spin-valve films

Hiromi N. Fuke; Kazuhiro Saito; Masatoshi Yoshikawa; Hitoshi Iwasaki; Masashi Sahashi

doi:10.1063/1.125427

Influence of crystal structure and oxygen content on exchange-coupling properties of IrMn/CoFe spin-valve films

Hiromi N. Fuke, Kazuhiro Saito, Masatoshi Yoshikawa, Hitoshi Iwasaki, Masashi Sahashi

ENG - Electronic Engineering

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

39 Citations (Scopus)

Abstract

Investigations were made into the relationship between the exchange-coupling properties and the IrMn crystal grain size for CoFe/IrMn spin valves. The IrMn crystal grain size increased with increasing thickness and decreasing oxygen content of the IrMn layer. The increase in the IrMn grain size resulted in a higher blocking temperature (T_B) but a lower unidirectional anisotropy field (H_UA). This opposite dependence of T_B and H_UA on the IrMn grain size is different from those of other antiferromagnetic films such as FeMn, NiMn, and CrMnPt. An H_UA of 400 Oe at room temperature and a T_B of 300°C are obtained for CoFe (2 nm)/IrMn (10 nm) spin valves by controlling the oxygen content of the IrMn layer.

Original language	English
Pages (from-to)	3680-3682
Number of pages	3
Journal	Applied Physics Letters
Volume	75
Issue number	23
DOIs	https://doi.org/10.1063/1.125427
Publication status	Published - 1999 Dec 6

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Influence of crystal structure and oxygen content on exchange-coupling properties of IrMn/CoFe spin-valve films",

abstract = "Investigations were made into the relationship between the exchange-coupling properties and the IrMn crystal grain size for CoFe/IrMn spin valves. The IrMn crystal grain size increased with increasing thickness and decreasing oxygen content of the IrMn layer. The increase in the IrMn grain size resulted in a higher blocking temperature (TB) but a lower unidirectional anisotropy field (HUA). This opposite dependence of TB and HUA on the IrMn grain size is different from those of other antiferromagnetic films such as FeMn, NiMn, and CrMnPt. An HUA of 400 Oe at room temperature and a TB of 300°C are obtained for CoFe (2 nm)/IrMn (10 nm) spin valves by controlling the oxygen content of the IrMn layer.",

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T1 - Influence of crystal structure and oxygen content on exchange-coupling properties of IrMn/CoFe spin-valve films

AU - Fuke, Hiromi N.

AU - Saito, Kazuhiro

AU - Yoshikawa, Masatoshi

AU - Iwasaki, Hitoshi

AU - Sahashi, Masashi

PY - 1999/12/6

Y1 - 1999/12/6

N2 - Investigations were made into the relationship between the exchange-coupling properties and the IrMn crystal grain size for CoFe/IrMn spin valves. The IrMn crystal grain size increased with increasing thickness and decreasing oxygen content of the IrMn layer. The increase in the IrMn grain size resulted in a higher blocking temperature (TB) but a lower unidirectional anisotropy field (HUA). This opposite dependence of TB and HUA on the IrMn grain size is different from those of other antiferromagnetic films such as FeMn, NiMn, and CrMnPt. An HUA of 400 Oe at room temperature and a TB of 300°C are obtained for CoFe (2 nm)/IrMn (10 nm) spin valves by controlling the oxygen content of the IrMn layer.

AB - Investigations were made into the relationship between the exchange-coupling properties and the IrMn crystal grain size for CoFe/IrMn spin valves. The IrMn crystal grain size increased with increasing thickness and decreasing oxygen content of the IrMn layer. The increase in the IrMn grain size resulted in a higher blocking temperature (TB) but a lower unidirectional anisotropy field (HUA). This opposite dependence of TB and HUA on the IrMn grain size is different from those of other antiferromagnetic films such as FeMn, NiMn, and CrMnPt. An HUA of 400 Oe at room temperature and a TB of 300°C are obtained for CoFe (2 nm)/IrMn (10 nm) spin valves by controlling the oxygen content of the IrMn layer.

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Influence of crystal structure and oxygen content on exchange-coupling properties of IrMn/CoFe spin-valve films

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