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Unusual lattice constant changes and tunable magnetic moment compensation in Mn50− x Co25Ga25+ x alloys
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Image of FIG. 1.
FIG. 1.

(a) The variation of structure from Hg2CuTi-type Mn2CoGa to Cu2MnAl-type CoMnGa2, in which the Mn/Ga layer transforms into Ga/Ga layer. A, B, C, and D represent four interpenetrating fcc sublattices of Mn(A), Mn(B)/Ga(B), Co(C), and Ga(D), whose Wyckoff coordinates are (00 0), (1/4 1/4 1/4), (1/2 1/2 1/2), and (3/4 3/4 3/4), respectively. The arrows in different direction represent the alignment of the atomic moments. (b) XRD patterns of Mn50− x Co25Ga25+ x alloys (x = 0, 12.5, 25). Insets on the left are the superlattice reflection peaks of (111) and (200). Inset on the top right corner shows composition dependence of the lattice parameters of Mn50−xCo25Ga25+x alloys. The straight lines are from linear fitting.

Image of FIG. 2.
FIG. 2.

(a) Composition dependence of molecular moments, experimental (solid triangle) and calculated (open triangle), and the saturation magnetic field in Mn50− x Co25Ga25+ x alloys. The inset shows the magnetic field dependence of magnetization curves measured at 5 K. (b) Composition dependence of the calculated atomic moments of Mn (A) and Co (C) in Mn50− x Co25Ga25+ x alloys. The straight lines represent the linearly fitting for the calculated results.

Image of FIG. 3.
FIG. 3.

Schematic diagram for the changes of magnetic structure projected along the [111] plane in Mn50− x Co25Ga25+ x (x = 0, 12.5, 25) alloys.

Image of FIG. 4.
FIG. 4.

Composition dependence of Curie temperature of Mn50− x Co25Ga25+ x alloys. The straight line results from the linearly fitting the experimental data. The inset is the M-T curves of the samples (x = 0, 12.5, 25) under a magnetic field of 100 Oe for Curie temperature determining.


Generic image for table
Table I.

Calculated molecular magnetic moments (Mcalc. ) and measured molecular magnetic moments (Mexp. ) (in μ B/f.u.), as well as the calculated atomic magnetic moments (in μ B/atom) for Mn50−xCo25Ga25 + x alloys with various compositions.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unusual lattice constant changes and tunable magnetic moment compensation in Mn50−xCo25Ga25+x alloys