Pressure dependence of magnetoresistance for Fe/Cr multilayers

K. Suenaga; S. Higashihara; G. Oomi; K. Saito; S. Mitani; Koki Takanashi

doi:10.1109/TMAG.2006.871544

Pressure dependence of magnetoresistance for Fe/Cr multilayers

K. Suenaga, S. Higashihara, G. Oomi, K. Saito, S. Mitani, Koki Takanashi

Materials Development Division

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

9 Citations (Scopus)

Abstract

The magnetoresistance (MR) in Fe/Cr magnetic multilayers (MML) has been measured under high pressure up to 2.5 GPa. It is found that the spin-dependent scattering plays an important role in the pressure dependence of MR ratio. In the present work, for [Fe(20 Å)/Cr(10 Å)]₂₀ MML with antiferromagnetic (AF) state, the pressure coefficient of saturation field H_s is (1/H_s)(part;H_s/dP) = 3.3 × 10 ^-2 GPa^-1 between 0.1 and 2.5 GPa. We found that the (1/|J|)(∂|J|/∂P) for AF-Fe/Cr MML with polycrystalline structure is opposite in sign to that with epitaxial one. For [Fe(20 Å)/Cr(22 Å)]₂₀ MML with ferromagnetic (F) state, anisotropic magnetoresistance (AMR) decreases with increasing pressure. It is suggested that the anisotropy constant decreases with weakening spin-orbit interaction at high pressure. At high field, the AMR is easily suppressed by applying pressure while the giant magnetoresistance around H_s increases slightly with increasing pressure for polycrystalline Fe/Cr MML.

Original language	English
Pages (from-to)	1499-1502
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	42
Issue number	5
DOIs	https://doi.org/10.1109/TMAG.2006.871544
Publication status	Published - 2006 May 1

Keywords

Giant magnetoresistance
Multilayers
Pressure effects
Superlattices
Thin films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Pressure dependence of magnetoresistance for Fe/Cr multilayers",

abstract = "The magnetoresistance (MR) in Fe/Cr magnetic multilayers (MML) has been measured under high pressure up to 2.5 GPa. It is found that the spin-dependent scattering plays an important role in the pressure dependence of MR ratio. In the present work, for [Fe(20 {\AA})/Cr(10 {\AA})]20 MML with antiferromagnetic (AF) state, the pressure coefficient of saturation field Hs is (1/Hs)(part;Hs/dP) = 3.3 × 10 -2 GPa-1 between 0.1 and 2.5 GPa. We found that the (1/|J|)(∂|J|/∂P) for AF-Fe/Cr MML with polycrystalline structure is opposite in sign to that with epitaxial one. For [Fe(20 {\AA})/Cr(22 {\AA})]20 MML with ferromagnetic (F) state, anisotropic magnetoresistance (AMR) decreases with increasing pressure. It is suggested that the anisotropy constant decreases with weakening spin-orbit interaction at high pressure. At high field, the AMR is easily suppressed by applying pressure while the giant magnetoresistance around Hs increases slightly with increasing pressure for polycrystalline Fe/Cr MML.",

keywords = "Giant magnetoresistance, Multilayers, Pressure effects, Superlattices, Thin films",

author = "K. Suenaga and S. Higashihara and G. Oomi and K. Saito and S. Mitani and Koki Takanashi",

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AU - Suenaga, K.

AU - Higashihara, S.

AU - Oomi, G.

AU - Saito, K.

AU - Mitani, S.

AU - Takanashi, Koki

PY - 2006/5/1

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N2 - The magnetoresistance (MR) in Fe/Cr magnetic multilayers (MML) has been measured under high pressure up to 2.5 GPa. It is found that the spin-dependent scattering plays an important role in the pressure dependence of MR ratio. In the present work, for [Fe(20 Å)/Cr(10 Å)]20 MML with antiferromagnetic (AF) state, the pressure coefficient of saturation field Hs is (1/Hs)(part;Hs/dP) = 3.3 × 10 -2 GPa-1 between 0.1 and 2.5 GPa. We found that the (1/|J|)(∂|J|/∂P) for AF-Fe/Cr MML with polycrystalline structure is opposite in sign to that with epitaxial one. For [Fe(20 Å)/Cr(22 Å)]20 MML with ferromagnetic (F) state, anisotropic magnetoresistance (AMR) decreases with increasing pressure. It is suggested that the anisotropy constant decreases with weakening spin-orbit interaction at high pressure. At high field, the AMR is easily suppressed by applying pressure while the giant magnetoresistance around Hs increases slightly with increasing pressure for polycrystalline Fe/Cr MML.

AB - The magnetoresistance (MR) in Fe/Cr magnetic multilayers (MML) has been measured under high pressure up to 2.5 GPa. It is found that the spin-dependent scattering plays an important role in the pressure dependence of MR ratio. In the present work, for [Fe(20 Å)/Cr(10 Å)]20 MML with antiferromagnetic (AF) state, the pressure coefficient of saturation field Hs is (1/Hs)(part;Hs/dP) = 3.3 × 10 -2 GPa-1 between 0.1 and 2.5 GPa. We found that the (1/|J|)(∂|J|/∂P) for AF-Fe/Cr MML with polycrystalline structure is opposite in sign to that with epitaxial one. For [Fe(20 Å)/Cr(22 Å)]20 MML with ferromagnetic (F) state, anisotropic magnetoresistance (AMR) decreases with increasing pressure. It is suggested that the anisotropy constant decreases with weakening spin-orbit interaction at high pressure. At high field, the AMR is easily suppressed by applying pressure while the giant magnetoresistance around Hs increases slightly with increasing pressure for polycrystalline Fe/Cr MML.

KW - Giant magnetoresistance

KW - Multilayers

KW - Pressure effects

KW - Superlattices

KW - Thin films

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Pressure dependence of magnetoresistance for Fe/Cr multilayers

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