Abstract
Abstract The investigation of the magnetic and structural characteristic of Mn50-xFexRh50 alloy is of physical importance due to the phase transition behavior. In this study, a series of highly ordered epitaxial films with varying Fe concentrations are grown on MgO (001) substrate. At low Fe concentrations (x=0, 2, 6), a separation between the structural phase transition and magnetic phase transition is observed. Different with the structural phase transition, the temperature-dependent magnetization presents a quite large temperature hysteresis behavior. In addition, the structural transition induces further tetragonal distortion and forms intermediate phase between B2 and L10 structure. This separated magnetic and structural phase transition has been further validated through XRD, anisotropic magnetoresistance and spin pumping measurements. Moreover, with the further increase in the Fe concentration, the Mn50-xFexRh50 films shows ferromagnetic behaviors due to the competitive magnetic exchange interaction, while the structural phase transition is suppressed.
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