Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films
Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (Al) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic Ll0 structure were identified by x-ray diffraction (XRD) and transmission elect...
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| Veröffentlicht in: | Journal of electronic materials 2003-11, Vol.32 (11), p.1155-1159 |
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| creator | LADWIG, Peter F YING YANG LING DING TSU, I.-Fei CHANG, Y. Austin |
| description | Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (Al) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic Ll0 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 Al 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. |
| doi_str_mv | 10.1007/s11664-003-0005-6 |
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Austin</creator><creatorcontrib>LADWIG, Peter F ; YING YANG ; LING DING ; TSU, I.-Fei ; CHANG, Y. Austin</creatorcontrib><description>Sputter-deposited, equiatomic Ni-Mn thin films were observed to possess a metastable, nanocrystalline, chemically disordered, fcc (Al) structure. Grain growth and a phase change to a chemically ordered, antiferromagnetic Ll0 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 Al to L10 phase change was calculated as -3.5 kJ/mol, which agrees with thermodynamic modeling. 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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Giant magnetoresistance Magnetic properties and materials Magnetotransport phenomena, materials for magnetotransport Physics |
| title | Paramagnetic-to-antiferromagnetic phase transformation in sputter-deposited Ni-Mn thin films |
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