First-principles calculations of spin spirals in Ni2MnGa and Ni2MnAl

Abstract

We report here non-collinear magnetic configurations in the Heusler alloys Ni2MnGa and Ni2MnAl which are interesting in the context of the magnetic shape memory effect. The total energies for different spin spirals are calculated and the ground state magnetic structures are identified. The calculated dispersion curves are used to estimate the Curie temperature which is found to be in good agreement with experiments. In addition, the variation of the magnetic moment as a function of the spiral structure is studied. Most of the variation is associated with Ni, and symmetry constraints relevant for the magnetization are identified. Based on the calculated results, the effect of the constituent atoms in determining the Curie temperature is discussed.

7 pages, 10 figures

References in corpus (1)

• Ab-initio calculations of exchange interactions, spin-wave stiffness constants, and Curie temperatures of Fe, Co, and Ni

Cited by in corpus (11)

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• Influence of Ni doping on the electronic structure of Ni_2MnGa
• An efficient control of Curie temperature $T_C$ in Ni-Mn-Ga alloys
• Heusler compounds -- how to tune the magnetocrystalline anisotropy
• Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys
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• Carrier-induced Antisymmetric-symmetric Tendencies of Spin Stiffness in Zigzag Graphene Nanoribbons
• Spin filter for arbitrary spins by substrate engineering
• First-principles Study of Spin-wave Excitations of 3$d$ Transition Metals with Linear Combination of Pseudo-atomic Orbitals