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Structure, magnetism, and magnetic compensation behavior of Co50-xMn25Ga25+ x and Co50- x Mn25+ x Ga25 Heusler alloys
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10.1063/1.4794811
/content/aip/journal/jap/113/10/10.1063/1.4794811
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/10/10.1063/1.4794811

Figures

Image of FIG. 1.
FIG. 1.

The crystal structure of Full-Heusler compounds X2YZ with four interpenetrating fcc sublattices of A, B, C, and D.

Image of FIG. 2.
FIG. 2.

DSC curves of Co50- x Mn25+ x Ga25 (a) and Co50- x Mn25Ga25+ x (b) alloys. The Tt and Tm represent the order-disorder transition temperature, i.e., from L21 to B2 or Hg2CuTi-type to B2 structure, and melting temperature, respectively.

Image of FIG. 3.
FIG. 3.

XRD patterns of the Co50- x Mn25Ga25+ x (a) and Co50- x Mn25+ x Ga25 (b) alloys (x = 0, 7.5, 12, 17.5, 25). The left column of each panel shows the superlattice peaks of (111) and (200) and the right column is for the main peaks. Insets on the top right corner show the composition dependence of the degree of ordering S. The open triangle and square represent the data taken from the literature (Refs. 22 and 35 ), respectively.

Image of FIG. 4.
FIG. 4.

The composition dependence of the lattice parameters of the Co50- x Mn25Ga25+ x and Co50- x Mn25+ x Ga25 (x = 0–25) alloys. The arrow indicates the kink behavior. The inset is the crystal structure of CoMnGa2 Heusler alloy.

Image of FIG. 5.
FIG. 5.

(a) and (b) show the representative magnetization curves of Co50- x Mn25Ga25+ x (left column for x ≦ 15 and right column for x > 15) and Co50- x Mn25+ x Ga25 (x = 0-25) alloys measured at 5 K, respectively. (c) The composition dependence of molecular magnetic moments, measured (solid triangle) and calculated (open triangle), of Co50- x Mn25Ga25+ x and Co50- x Mn25+ x Ga25 (x = 0–25) alloys.

Image of FIG. 6.
FIG. 6.

The schematic diagram of the magnetic structure changes for Co50- x Mn25+ x Ga25 and Co50- x Mn25Ga25+ x (x = 0-25), respectively.

Image of FIG. 7.
FIG. 7.

The composition dependence of Curie temperature of Co50- x Mn25+ x Ga25 (a) and Co50- x Mn25Ga25+ x (b) (x = 0–25) alloys. The inset of (a) shows the typical temperature dependence of magnetization curves of Co50- x Mn25+ x Ga25 (x = 2.5, 7.5, 12, 22.5) alloys measured under 100 Oe. The inset of (b) on the bottom left corner shows the typical temperature dependence of magnetization curves of Co50- x Mn25Ga25+ x (x = 0, 5, 7.5, 10) measured under 100 Oe. While the inset of (b) on the top right corner shows the typical temperature dependence of magnetization curves of Co50- x Mn25Ga25+ x (x = 20, 25) under zero field cooling (solid circles) and field cooing (open circles), respectively. The Curie temperature was determined from the minimum value of dM(T)/dT curves.

Image of FIG. 8.
FIG. 8.

Calculated spin-projected DOS plots for the Co50- x Mn25+ x Ga25 alloys. The total DOS (a), the partial DOS for d-electrons of Mn (A), Mn (B), Co (A), Co (C) atoms and for p-electrons of Ga (D) atoms are illustrated in (a)–(f), respectively. The upper halves of each panel display the spin-up states.

Image of FIG. 9.
FIG. 9.

Calculated spin-projected DOS plots for the Co50- x Mn25Ga25+ x alloys. The total DOS (a), the partial DOS for d-electrons of Mn (A), Mn (B), Co (A), Co (C) atoms and for p-electrons of Ga (B) and Ga (D) atoms are illustrated in (a)–(g), respectively. The upper halves of each panel display the spin-up states.

Tables

Generic image for table
Table I.

The lattice parameters of Co50- x Mn25Ga25+ x and Co50- x Mn25+ x Ga25 (x = 0–25) alloys with various compositions. Here a and a* denote the lattice parameters of Co50- x Mn25Ga25+ x and Co50- x Mn25+ x Ga25 samples, respectively.

Generic image for table
Table II.

The 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 Co50- x Mn25+ x Ga25 alloys with various compositions.

Generic image for table
Table III.

The 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 Co50- x Mn25Ga25+ x alloys with various compositions.

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/content/aip/journal/jap/113/10/10.1063/1.4794811
2013-03-11
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structure, magnetism, and magnetic compensation behavior of Co50-xMn25Ga25+x and Co50-xMn25+xGa25 Heusler alloys
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/10/10.1063/1.4794811
10.1063/1.4794811
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