Giant magnetoresistance in granular ferromagnetic systems of Ni3Mn alloy

Teiko Okazaki; Satoshi Sugimoto; Yoshinori Aono; Takafumi Miyanaga; Motofumi Homma

doi:10.1143/jjap.38.5071

Giant magnetoresistance in granular ferromagnetic systems of Ni₃Mn alloy

Teiko Okazaki, Satoshi Sugimoto, Yoshinori Aono, Takafumi Miyanaga, Motofumi Homma

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

1 Citation (Scopus)

Abstract

Giant magnetoresistance (GMR) phenomena were investigated in the inhomogencous phase of NisMn alloy, where magnetically ordered single-domain clusters are distributed in a disordered nonmagnetic matrix. The observed GMR varies with the long-range-order parameter S and has values ranging from -0.5% to -1.8% for 0.1 < S < 0.5. The GMR is proportional to [1 -(M/Ms)²] with an applied magnetic field, where M and M_s are the global and saturation magnetizations, respectively. We found that the GMR is correlated with the average size (in) and the volume fraction e of the ferromagnetic clusters. The GMR is maximized at (m) ∼ 3³ and ε ∼ 0.25, these values being obtained from analysis using a superferromagnetic model.

Original language	English
Pages (from-to)	5071-5074
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	38
Issue number	9 A
DOIs	https://doi.org/10.1143/jjap.38.5071
Publication status	Published - 1999
Externally published	Yes

Keywords

Cluster size
Giant magnetoresistance
Inhomogeneous phase
Magnetic analysis
NiMn

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.38.5071

Cite this

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title = "Giant magnetoresistance in granular ferromagnetic systems of Ni3Mn alloy",

abstract = "Giant magnetoresistance (GMR) phenomena were investigated in the inhomogencous phase of NisMn alloy, where magnetically ordered single-domain clusters are distributed in a disordered nonmagnetic matrix. The observed GMR varies with the long-range-order parameter S and has values ranging from -0.5% to -1.8% for 0.1 < S < 0.5. The GMR is proportional to [1 -(M/Ms)2] with an applied magnetic field, where M and Ms are the global and saturation magnetizations, respectively. We found that the GMR is correlated with the average size (in) and the volume fraction e of the ferromagnetic clusters. The GMR is maximized at (m) ∼ 33 and ε ∼ 0.25, these values being obtained from analysis using a superferromagnetic model.",

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author = "Teiko Okazaki and Satoshi Sugimoto and Yoshinori Aono and Takafumi Miyanaga and Motofumi Homma",

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T1 - Giant magnetoresistance in granular ferromagnetic systems of Ni3Mn alloy

AU - Okazaki, Teiko

AU - Sugimoto, Satoshi

AU - Aono, Yoshinori

AU - Miyanaga, Takafumi

AU - Homma, Motofumi

PY - 1999

Y1 - 1999

N2 - Giant magnetoresistance (GMR) phenomena were investigated in the inhomogencous phase of NisMn alloy, where magnetically ordered single-domain clusters are distributed in a disordered nonmagnetic matrix. The observed GMR varies with the long-range-order parameter S and has values ranging from -0.5% to -1.8% for 0.1 < S < 0.5. The GMR is proportional to [1 -(M/Ms)2] with an applied magnetic field, where M and Ms are the global and saturation magnetizations, respectively. We found that the GMR is correlated with the average size (in) and the volume fraction e of the ferromagnetic clusters. The GMR is maximized at (m) ∼ 33 and ε ∼ 0.25, these values being obtained from analysis using a superferromagnetic model.

AB - Giant magnetoresistance (GMR) phenomena were investigated in the inhomogencous phase of NisMn alloy, where magnetically ordered single-domain clusters are distributed in a disordered nonmagnetic matrix. The observed GMR varies with the long-range-order parameter S and has values ranging from -0.5% to -1.8% for 0.1 < S < 0.5. The GMR is proportional to [1 -(M/Ms)2] with an applied magnetic field, where M and Ms are the global and saturation magnetizations, respectively. We found that the GMR is correlated with the average size (in) and the volume fraction e of the ferromagnetic clusters. The GMR is maximized at (m) ∼ 33 and ε ∼ 0.25, these values being obtained from analysis using a superferromagnetic model.

KW - Cluster size

KW - Giant magnetoresistance

KW - Inhomogeneous phase

KW - Magnetic analysis

KW - NiMn

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