Magnetic properties of B doped Mn-Ga-C based alloys

Document Type

Article

Publication Date

4-1-2024

Abstract

We present results on the structural and magnetic properties of the B-doped Mn60Ga20C20-xBx system with x = 0, 1, 2, 3, 4 and 5. A ball milling technique followed by pressing the components, and annealing under an ultra-high purity argon atmosphere for 2 h was employed to fabricate the samples. According to the XRD diffraction data, all samples can be described as single-phase compounds (i.e., the Mn3Ga cubic phase in the Pm–3 m space group) where impurity phases did not exceed 5 %. The compounds with x < 5 show similar physical behaviors as the parent, Mn3Ga2C2, which can be generally characterized by a low temperature transition from low to high magnetization states. High boron concentrations were found to completely suppress the antiferromagnetic state. The (x-TC) phase diagram at 10 K has been constructed and discussed. The magnetocaloric measurements result in magnetic entropy changes of 3.0 Jkg-1k−1 at 5 T and ΔTad by direct measurement of about 0.8 K at 1.8 T.

Publication Source (Journal or Book title)

Journal of Magnetism and Magnetic Materials

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