6533b839fe1ef96bd12a5949

RESEARCH PRODUCT

Gradual phase transition from ferromagnetic tetragonal to antiferromagnetic cubic states in Mn Ga (1.80 ≤ x ≤ 3.03) thin films

Myung-hwa JungYoung Haeng LeeYunsun JangChungman KimKyujoon LeeHyun-woo BangWoosuk Yoo

subject

Phase transitionMaterials scienceCondensed matter physicsSpintronicsMechanical EngineeringMetals and Alloys02 engineering and technologyCrystal structure010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesMagnetizationTetragonal crystal systemFerromagnetismMechanics of MaterialsPhase (matter)Materials ChemistryAntiferromagnetism0210 nano-technology

description

Abstract The structural, magnetic, and electronic properties of MnxGa thin films are investigated as varying the Mn composition (1.80 ≤ x ≤ 3.03). The variation of x in MnxGa films dramatically changes the crystal structure as well as the magnetic properties. With increasing x, we observe the gradual phase transition from a ferromagnetic tetragonal state to an antiferromagnetic cubic state. The structural characterization reveals that the D022 tetragonal structure of Mn2Ga is slowly transformed to the L12 cubic structure of Mn3Ga. Two phases coexist around x = 2.4. The magnetization is systematically reduced as x increases, ending to an antiferromagnetic state of cubic Mn3Ga, and the electrical resistivity increases with x. Such highly tunable magnetic and electronic properties in MnxGa phase simply by the variation of the Mn/Ga ratio provide advantages to be used for spintronic device applications.

yearjournalcountryeditionlanguage
2019-11-01Journal of Alloys and Compounds
https://doi.org/10.1016/j.jallcom.2019.151988