Synthesis and magnetism of single-phase Mn-Ga films

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4908022· OSTI ID:22410145

Skomski, R.; Sellmyer, D. J. ^[1]; Kharel, P. ^[1]; Valloppilly, S. ^[1]

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1. Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 (United States)

Single-phase noncubic Mn-Ga films with a thickness of about 200 nm were fabricated by an in situ annealing of [Mn(x)/Ga(y)/Mn(x)]{sub 5} multilayers deposited by e-beam evaporation. Mn-Ga alloys prepared in three different compositions Mn{sub 2}Ga{sub 5} and Mn{sub 2}Ga were found to crystallize in the tetragonal tP14 and tP2 structures, respectively. Mn{sub 3}Ga crystallizes in the hexagonal hp8 or tetragonal tI8 structures. All three alloys show substantial magnetocrystalline anisotropy between 7 and 10 Mergs/cm{sup 3}. The samples show hard magnetic properties including coercivities of Mn{sub 2}Ga{sub 5} and Mn{sub 2}Ga about 12.0 kOe and of Mn{sub 3}Ga about 13.4 kOe. The saturation magnetization and Curie temperature of Mn{sub 2}Ga{sub 5}, Mn{sub 2}Ga, and Mn{sub 3}Ga are 183 emu/cm{sup 3} and 435 K, 342 emu/cm{sup 3} and 697 K, and 151 emu/cm{sup 3} and 798 K, respectively. The samples show metallic electron transport up to room temperature.

• OSTI ID: 22410145
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
COERCIVE FORCE
CURIE POINT
ELECTRON BEAMS
ENERGY BEAM DEPOSITION
EVAPORATION
FILMS
GALLIUM
HEXAGONAL LATTICES
INTERMETALLIC COMPOUNDS
LAYERS
MAGNETIC PROPERTIES
MAGNETISM
MAGNETIZATION
MANGANESE
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES