First principles studies of the Gilbert damping and exchange interactions for half-metallic Heuslers alloys

Abstract

Heusler alloys have been intensively studied due to the wide variety of properties that they exhibit. One of these properties is of particular interest for technological applications, i.e. the fact that some Heusler alloys are half-metallic. In the following, a systematic study of the magnetic properties of three different Heusler families ${\text{Co}}_2\text{Mn}\text{Z}$, ${\text{Co}}_2\text{Fe}\text{Z}$ and ${\text{Mn}}_2\text{V}\text{Z}$ with $\text{Z}=\left(\text{Al, Si, Ga, Ge}\right)$ is performed. A key aspect is the determination of the Gilbert damping from first principles calculations, with special focus on the role played by different approximations, the effect that substitutional disorder and temperature effects. Heisenberg exchange interactions and critical temperature for the alloys are also calculated as well as magnon dispersion relations for representative systems, the ferromagnetic ${\text{Co}}_2\text{Fe}\text{Si}$ and the ferrimagnetic ${\text{Mn}}_2\text{V}\text{Al}$. Correlations effects beyond standard density-functional theory are treated using both the local spin density approximation including the Hubbard $U$ and the local spin density approximation plus dynamical mean field theory approximation, which allows to determine if dynamical self-energy corrections can remedy some of the inconsistencies which were previously reported for these alloys.

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Cited by in corpus (8)

• Temperature-dependent Gilbert damping of Co2FeAl thin films with different degree of atomic order
• Non-local Gilbert damping tensor within the torque-torque correlation model
• Spin pumping and spin torque in interfacial tailored Co2FeAl/\b{eta}-Ta layers
• Half-metallicity and magnetism in the Co${}_2$MnAl/CoMnVAl heterostructure
• First-principles study of exchange stiffness constant of half-metallic Heusler alloys Co2MnZ (Z= Si, Al) at finite temperatures: Spin fluctuation-induced effective half metallicity
• Regularities and features in the behavior of electrical and magnetic properties of Co${}_2$FeZ (Z = Al, Si, Ga, Ge, Sn, Sb) half-metallic ferromagnetic Heusler alloys
• First-principles study of magnetic and spin-dependent transport properties of Mn2VZ (Z = Al, Ga) with negative spin polarization using a disordered local moment approach at finite temperatures
• Local magnetic structure in fully and partially ordered V${}_2$$X$Al Heusler alloys ($X$=Cr, Mn, Fe, Co, Ni)