Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Y. Huh; P. Kharel; V. R. Shah; X. Z. Li; R. Skomski; D. J. Sellmyer

doi:10.1063/1.4812561

Magnetism and electron transport of Mn_yGa (1 < y < 2) nanostructures

Y. Huh, P. Kharel, V. R. Shah, X. Z. Li, R. Skomski, D. J. Sellmyer

Physics and Astronomy

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

40 Scopus citations

Abstract

Nanostructured Mn_yGa ribbons with varying Mn concentrations including Mn_1.2Ga, Mn_1.4Ga, Mn_1.6Ga, and Mn_1.9Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y = 1.2, 1.4, and 1.6 prefers the tetragonal L1₀ structure and that with y = 1.9 prefers the D0₂₂ structure. We have found a maximum saturation magnetization of 621 emu/cm ³ in Mn_1.2Ga which decreases monotonically to 300 emu/cm³ as y reaches 1.9. Although both the L1₀- and D0₂₂-Mn_yGa samples show a high Curie temperature (T _c) well above room temperature, the value of T_c decreases almost linearly from 702 K for Mn_1.9Ga to 551 K for Mn _1.2Ga. All the ribbons are metallic between 2 K and 300 K but the Mn_1.2Ga also shows a resistance minimum near 15 K. The observed magnetic properties of the Mn_yGa ribbons are consistent with the competing ferromagnetic coupling between Mn moments in the regular L1 ₀-MnGa lattice sites and antiferromagnetic coupling with excess Mn moments occupying Ga sites.

Original language	English (US)
Article number	013906
Journal	Journal of Applied Physics
Volume	114
Issue number	1
DOIs	https://doi.org/10.1063/1.4812561
State	Published - Jul 7 2013

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.4812561

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title = "Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures",

abstract = "Nanostructured MnyGa ribbons with varying Mn concentrations including Mn1.2Ga, Mn1.4Ga, Mn1.6Ga, and Mn1.9Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y = 1.2, 1.4, and 1.6 prefers the tetragonal L10 structure and that with y = 1.9 prefers the D022 structure. We have found a maximum saturation magnetization of 621 emu/cm 3 in Mn1.2Ga which decreases monotonically to 300 emu/cm3 as y reaches 1.9. Although both the L10- and D022-MnyGa samples show a high Curie temperature (T c) well above room temperature, the value of Tc decreases almost linearly from 702 K for Mn1.9Ga to 551 K for Mn 1.2Ga. All the ribbons are metallic between 2 K and 300 K but the Mn1.2Ga also shows a resistance minimum near 15 K. The observed magnetic properties of the MnyGa ribbons are consistent with the competing ferromagnetic coupling between Mn moments in the regular L1 0-MnGa lattice sites and antiferromagnetic coupling with excess Mn moments occupying Ga sites.",

author = "Y. Huh and P. Kharel and Shah, {V. R.} and Li, {X. Z.} and R. Skomski and Sellmyer, {D. J.}",

note = "Funding Information: This research was supported by DOE (DE-F602-04ER46152) (DJS, RS), NSF MRSEC (NSF-DMR-0820521) (PK, YH), NSF MRI TEM (DMR-0960110) and NCMN (VRS, XZL). We would like to thank J. E. Shield for using his sample preparation facility. ",

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T1 - Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

AU - Huh, Y.

AU - Kharel, P.

AU - Shah, V. R.

AU - Li, X. Z.

AU - Skomski, R.

AU - Sellmyer, D. J.

N1 - Funding Information: This research was supported by DOE (DE-F602-04ER46152) (DJS, RS), NSF MRSEC (NSF-DMR-0820521) (PK, YH), NSF MRI TEM (DMR-0960110) and NCMN (VRS, XZL). We would like to thank J. E. Shield for using his sample preparation facility.

PY - 2013/7/7

Y1 - 2013/7/7

N2 - Nanostructured MnyGa ribbons with varying Mn concentrations including Mn1.2Ga, Mn1.4Ga, Mn1.6Ga, and Mn1.9Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y = 1.2, 1.4, and 1.6 prefers the tetragonal L10 structure and that with y = 1.9 prefers the D022 structure. We have found a maximum saturation magnetization of 621 emu/cm 3 in Mn1.2Ga which decreases monotonically to 300 emu/cm3 as y reaches 1.9. Although both the L10- and D022-MnyGa samples show a high Curie temperature (T c) well above room temperature, the value of Tc decreases almost linearly from 702 K for Mn1.9Ga to 551 K for Mn 1.2Ga. All the ribbons are metallic between 2 K and 300 K but the Mn1.2Ga also shows a resistance minimum near 15 K. The observed magnetic properties of the MnyGa ribbons are consistent with the competing ferromagnetic coupling between Mn moments in the regular L1 0-MnGa lattice sites and antiferromagnetic coupling with excess Mn moments occupying Ga sites.

AB - Nanostructured MnyGa ribbons with varying Mn concentrations including Mn1.2Ga, Mn1.4Ga, Mn1.6Ga, and Mn1.9Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y = 1.2, 1.4, and 1.6 prefers the tetragonal L10 structure and that with y = 1.9 prefers the D022 structure. We have found a maximum saturation magnetization of 621 emu/cm 3 in Mn1.2Ga which decreases monotonically to 300 emu/cm3 as y reaches 1.9. Although both the L10- and D022-MnyGa samples show a high Curie temperature (T c) well above room temperature, the value of Tc decreases almost linearly from 702 K for Mn1.9Ga to 551 K for Mn 1.2Ga. All the ribbons are metallic between 2 K and 300 K but the Mn1.2Ga also shows a resistance minimum near 15 K. The observed magnetic properties of the MnyGa ribbons are consistent with the competing ferromagnetic coupling between Mn moments in the regular L1 0-MnGa lattice sites and antiferromagnetic coupling with excess Mn moments occupying Ga sites.

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