Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films

Peter F. Ladwig; Ying Yang; Ling Ding; I. Fei Tsu; Y. Austin Chang

doi:10.1007/s11664-003-0005-6

Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films

Peter F. Ladwig, Ying Yang, Ling Ding, I. Fei Tsu, Y. Austin Chang

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

8 Scopus citations

Abstract

Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (A1) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic L1₀ structure were identified by x-ray diffraction (XRD) and transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) experiments revealed exothermic signals that correspond to the grain growth and phase transformation reactions. The enthalpy of transformation for the A1 to L1₀ phase change was calculated as -3.5 kJ/mol, which agrees with thermodynamic modeling. An activation energy of 139 kJ/mol was calculated for the phase transformation by the Kissinger method.

Original language	English
Pages (from-to)	1155-1159
Number of pages	5
Journal	Journal of Electronic Materials
Volume	32
Issue number	11
DOIs	https://doi.org/10.1007/s11664-003-0005-6
State	Published - Nov 2003
Externally published	Yes

Funding

The authors thank Chris Pelto for his review of this manuscript. This research is supported by Grant No. DE-FG02-99ER45777 from the Division of Materials Science, Office of Basic Energy Research, Department of Energy; Seagate Technology; and the Wisconsin Distinguished Professorship.

Funders	Funder number
Office of Basic Energy Research
U.S. Department of Energy
Division of Materials Sciences and Engineering
Seagate Technology

Keywords

Antiferromagnetic materials
Calorimetry
Grain growth
Magnetoresistance
Manganese alloys
Metastability
Nickel alloys
Phase transformation
Spin valves
Sputter deposition
Thin films

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10.1007/s11664-003-0005-6

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title = "Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films",

abstract = "Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (A1) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic L10 structure were identified by x-ray diffraction (XRD) and transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) experiments revealed exothermic signals that correspond to the grain growth and phase transformation reactions. The enthalpy of transformation for the A1 to L10 phase change was calculated as -3.5 kJ/mol, which agrees with thermodynamic modeling. An activation energy of 139 kJ/mol was calculated for the phase transformation by the Kissinger method.",

keywords = "Antiferromagnetic materials, Calorimetry, Grain growth, Magnetoresistance, Manganese alloys, Metastability, Nickel alloys, Phase transformation, Spin valves, Sputter deposition, Thin films",

author = "Ladwig, {Peter F.} and Ying Yang and Ling Ding and Tsu, {I. Fei} and Chang, {Y. Austin}",

year = "2003",

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doi = "10.1007/s11664-003-0005-6",

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volume = "32",

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journal = "Journal of Electronic Materials",

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T1 - Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films

AU - Ladwig, Peter F.

AU - Yang, Ying

AU - Ding, Ling

AU - Tsu, I. Fei

AU - Chang, Y. Austin

PY - 2003/11

Y1 - 2003/11

N2 - Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (A1) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic L10 structure were identified by x-ray diffraction (XRD) and transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) experiments revealed exothermic signals that correspond to the grain growth and phase transformation reactions. The enthalpy of transformation for the A1 to L10 phase change was calculated as -3.5 kJ/mol, which agrees with thermodynamic modeling. An activation energy of 139 kJ/mol was calculated for the phase transformation by the Kissinger method.

AB - Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (A1) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic L10 structure were identified by x-ray diffraction (XRD) and transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) experiments revealed exothermic signals that correspond to the grain growth and phase transformation reactions. The enthalpy of transformation for the A1 to L10 phase change was calculated as -3.5 kJ/mol, which agrees with thermodynamic modeling. An activation energy of 139 kJ/mol was calculated for the phase transformation by the Kissinger method.

KW - Antiferromagnetic materials

KW - Calorimetry

KW - Grain growth

KW - Magnetoresistance

KW - Manganese alloys

KW - Metastability

KW - Nickel alloys

KW - Phase transformation

KW - Spin valves

KW - Sputter deposition

KW - Thin films

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JO - Journal of Electronic Materials

JF - Journal of Electronic Materials

IS - 11

ER -

Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films

Abstract

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Keywords

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