Magnetic and transport properties of MnBi/Bi nanocomposites

Kyongha Kang; L. H. Lewis; Y. F. Hu; Qiang Li; A. R. Moodenbaugh; Young Suk Choi

doi:10.1063/1.2158692

Magnetic and transport properties of MnBi/Bi nanocomposites

Kyongha Kang
, L. H. Lewis
, Y. F. Hu
, Qiang Li
, A. R. Moodenbaugh
, Young Suk Choi

Physics and Astronomy

Stony Brook University

Brookhaven National Laboratory

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

15 Scopus citations

Abstract

The magnetic and transport properties of a nanostructured Mn-Bi eutectic composition (∼ Mn5 Bi95) produced by melt spinning and low-temperature/short time vacuum annealing were studied. A hysteretic magnetostructural transformation from low-temperature phase to high-temperature phase MnBi is confirmed at 520 K. The fact that the transition temperature is lower than that reported for bulk MnBi (633 K), is tentatively attributed to interfacial strain between MnBi and the Bi matrix. A positive temperature coefficient of coercivity is confirmed in the nanocomposites, with a maximum coercivity value of 36 kOe at 500 K. Magnetic field annealing the as-spun composites (525 K at 10 kOe) produces nanoparticle alignment. Annealed MnBiBi composites have a very large ordinary magnetoresistance (MR) ratio normal to the ribbon at 5 T, 275% at room temperature and 10 000% at 5 K.

Original language	English
Article number	08N703
Journal	Journal of Applied Physics
Volume	99
Issue number	8
DOIs	https://doi.org/10.1063/1.2158692
State	Published - 2006

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title = "Magnetic and transport properties of MnBi/Bi nanocomposites",

abstract = "The magnetic and transport properties of a nanostructured Mn-Bi eutectic composition (∼ Mn5 Bi95) produced by melt spinning and low-temperature/short time vacuum annealing were studied. A hysteretic magnetostructural transformation from low-temperature phase to high-temperature phase MnBi is confirmed at 520 K. The fact that the transition temperature is lower than that reported for bulk MnBi (633 K), is tentatively attributed to interfacial strain between MnBi and the Bi matrix. A positive temperature coefficient of coercivity is confirmed in the nanocomposites, with a maximum coercivity value of 36 kOe at 500 K. Magnetic field annealing the as-spun composites (525 K at 10 kOe) produces nanoparticle alignment. Annealed MnBiBi composites have a very large ordinary magnetoresistance (MR) ratio normal to the ribbon at 5 T, 275\% at room temperature and 10 000\% at 5 K.",

author = "Kyongha Kang and Lewis, \{L. H.\} and Hu, \{Y. F.\} and Qiang Li and Moodenbaugh, \{A. R.\} and Choi, \{Young Suk\}",

year = "2006",

doi = "10.1063/1.2158692",

language = "English",

volume = "99",

journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Magnetic and transport properties of MnBi/Bi nanocomposites

AU - Kang, Kyongha

AU - Lewis, L. H.

AU - Hu, Y. F.

AU - Li, Qiang

AU - Moodenbaugh, A. R.

AU - Choi, Young Suk

PY - 2006

Y1 - 2006

N2 - The magnetic and transport properties of a nanostructured Mn-Bi eutectic composition (∼ Mn5 Bi95) produced by melt spinning and low-temperature/short time vacuum annealing were studied. A hysteretic magnetostructural transformation from low-temperature phase to high-temperature phase MnBi is confirmed at 520 K. The fact that the transition temperature is lower than that reported for bulk MnBi (633 K), is tentatively attributed to interfacial strain between MnBi and the Bi matrix. A positive temperature coefficient of coercivity is confirmed in the nanocomposites, with a maximum coercivity value of 36 kOe at 500 K. Magnetic field annealing the as-spun composites (525 K at 10 kOe) produces nanoparticle alignment. Annealed MnBiBi composites have a very large ordinary magnetoresistance (MR) ratio normal to the ribbon at 5 T, 275% at room temperature and 10 000% at 5 K.

AB - The magnetic and transport properties of a nanostructured Mn-Bi eutectic composition (∼ Mn5 Bi95) produced by melt spinning and low-temperature/short time vacuum annealing were studied. A hysteretic magnetostructural transformation from low-temperature phase to high-temperature phase MnBi is confirmed at 520 K. The fact that the transition temperature is lower than that reported for bulk MnBi (633 K), is tentatively attributed to interfacial strain between MnBi and the Bi matrix. A positive temperature coefficient of coercivity is confirmed in the nanocomposites, with a maximum coercivity value of 36 kOe at 500 K. Magnetic field annealing the as-spun composites (525 K at 10 kOe) produces nanoparticle alignment. Annealed MnBiBi composites have a very large ordinary magnetoresistance (MR) ratio normal to the ribbon at 5 T, 275% at room temperature and 10 000% at 5 K.

UR - https://www.scopus.com/pages/publications/33646741385

U2 - 10.1063/1.2158692

DO - 10.1063/1.2158692

M3 - Article

SN - 0021-8979

VL - 99

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 8

M1 - 08N703

ER -

Magnetic and transport properties of MnBi/Bi nanocomposites

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