Magnetic and structural properties of rapidly quenched tetragonal Mn 3-xGa nanostructures

Y. Huh, P. Kharel, V. R. Shah, E. Krage, R. Skomski, J. E. Shield, D. J. Sellmyer

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Nanostructured Mn3-x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019 and cubic L21 Heusler crystal structures based on the concentration of Mn in Mn3-x Ga. Upon vacuum-annealing the samples at 450 °C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D022 structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn1.9 Ga and Mn 2.1 Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn2.6 Ga and Mn3.0 Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3-x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn2.6 Ga and Mn3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3-xGa. The maximum magnetization of 57 emu/g (300 emu/cm3) and the coercivity of 6.5 kOe were measured in the Mn1.9 Ga and Mn3.0 Ga ribbons, respectively.

Original languageEnglish (US)
Article number6558957
Pages (from-to)3277-3280
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - Aug 2 2013

Fingerprint

Curie temperature
Coercive force
Structural properties
Nanostructures
Magnetization
Magnetic properties
Phase transitions
Annealing
Melt spinning
Melting
Anisotropy
Diffraction
Crystal structure
Vacuum
X rays
Temperature
Magnetometry

Keywords

  • Magnetic anisotropy
  • melt-spun ribbons
  • permanent magnet
  • spintronic device

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Magnetic and structural properties of rapidly quenched tetragonal Mn 3-xGa nanostructures. / Huh, Y.; Kharel, P.; Shah, V. R.; Krage, E.; Skomski, R.; Shield, J. E.; Sellmyer, D. J.

In: IEEE Transactions on Magnetics, Vol. 49, No. 7, 6558957, 02.08.2013, p. 3277-3280.

Research output: Contribution to journalArticle

Huh, Y. ; Kharel, P. ; Shah, V. R. ; Krage, E. ; Skomski, R. ; Shield, J. E. ; Sellmyer, D. J. / Magnetic and structural properties of rapidly quenched tetragonal Mn 3-xGa nanostructures. In: IEEE Transactions on Magnetics. 2013 ; Vol. 49, No. 7. pp. 3277-3280.
@article{a3a5828f909d412287b630957fe0f894,
title = "Magnetic and structural properties of rapidly quenched tetragonal Mn 3-xGa nanostructures",
abstract = "Nanostructured Mn3-x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019 and cubic L21 Heusler crystal structures based on the concentration of Mn in Mn3-x Ga. Upon vacuum-annealing the samples at 450 °C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D022 structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn1.9 Ga and Mn 2.1 Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn2.6 Ga and Mn3.0 Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3-x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn2.6 Ga and Mn3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3-xGa. The maximum magnetization of 57 emu/g (300 emu/cm3) and the coercivity of 6.5 kOe were measured in the Mn1.9 Ga and Mn3.0 Ga ribbons, respectively.",
keywords = "Magnetic anisotropy, melt-spun ribbons, permanent magnet, spintronic device",
author = "Y. Huh and P. Kharel and Shah, {V. R.} and E. Krage and R. Skomski and Shield, {J. E.} and Sellmyer, {D. J.}",
year = "2013",
month = "8",
day = "2",
doi = "10.1109/TMAG.2013.2244856",
language = "English (US)",
volume = "49",
pages = "3277--3280",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "7",

}

TY - JOUR

T1 - Magnetic and structural properties of rapidly quenched tetragonal Mn 3-xGa nanostructures

AU - Huh, Y.

AU - Kharel, P.

AU - Shah, V. R.

AU - Krage, E.

AU - Skomski, R.

AU - Shield, J. E.

AU - Sellmyer, D. J.

PY - 2013/8/2

Y1 - 2013/8/2

N2 - Nanostructured Mn3-x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019 and cubic L21 Heusler crystal structures based on the concentration of Mn in Mn3-x Ga. Upon vacuum-annealing the samples at 450 °C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D022 structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn1.9 Ga and Mn 2.1 Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn2.6 Ga and Mn3.0 Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3-x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn2.6 Ga and Mn3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3-xGa. The maximum magnetization of 57 emu/g (300 emu/cm3) and the coercivity of 6.5 kOe were measured in the Mn1.9 Ga and Mn3.0 Ga ribbons, respectively.

AB - Nanostructured Mn3-x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019 and cubic L21 Heusler crystal structures based on the concentration of Mn in Mn3-x Ga. Upon vacuum-annealing the samples at 450 °C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D022 structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn1.9 Ga and Mn 2.1 Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn2.6 Ga and Mn3.0 Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3-x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn2.6 Ga and Mn3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3-xGa. The maximum magnetization of 57 emu/g (300 emu/cm3) and the coercivity of 6.5 kOe were measured in the Mn1.9 Ga and Mn3.0 Ga ribbons, respectively.

KW - Magnetic anisotropy

KW - melt-spun ribbons

KW - permanent magnet

KW - spintronic device

UR - http://www.scopus.com/inward/record.url?scp=84880801954&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880801954&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2013.2244856

DO - 10.1109/TMAG.2013.2244856

M3 - Article

AN - SCOPUS:84880801954

VL - 49

SP - 3277

EP - 3280

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 7

M1 - 6558957

ER -