Abstract
The magnetic anisotropy determines the equilibrium orientation of the magnetization in a ferromagnet. In Mn-based inverse tetragonal Heusler compounds, a large uniaxial anisotropy makes these materials excellent candidates for both spin-transfer-torque and skyrmionic devices. Here, we present systematic investigations of the magnetocrystalline anisotropies in MnxPtSn films (x = 1.0–1.6). We find that the MnxPtSn films, grown by magnetron sputtering on MgO substrates, show a structural transition between x = 1.0 and 1.2 from cubic to tetragonal, where the tetragonal structure shows a twinned in-plane c-axis orientation. From ferromagnetic resonance measurements, we determine the out-of-plane and in-plane uniaxial anisotropies, taking into account the particular structural properties of the films. We find a strong dependence of the uniaxial anisotropies on the Mn concentration, as well as on structural distortions due to the lattice-matched growth. From temperature-dependent ferromagnetic resonance measurements, we infer the evolution of the in-plane uniaxial anisotropy and observe the presence of additional magnetic interactions and magnetization relaxation mechanisms around the spin reorientation transition.
Highlights
INTRODUCTIONThe preferred orientation of magnetic moments, may it be in collinear magnets or materials hosting unique types of noncoplanar spin textures, is connected to the crystal symmetry via the magnetocrystalline anisotropy (MCA)
From temperature-dependent ferromagnetic resonance measurements, we infer the evolution of the in-plane uniaxial anisotropy and observe the presence of additional magnetic interactions and magnetization relaxation mechanisms around the spin reorientation transition
The preferred orientation of magnetic moments, may it be in collinear magnets or materials hosting unique types of noncoplanar spin textures, is connected to the crystal symmetry via the magnetocrystalline anisotropy (MCA)
Summary
The preferred orientation of magnetic moments, may it be in collinear magnets or materials hosting unique types of noncoplanar spin textures, is connected to the crystal symmetry via the magnetocrystalline anisotropy (MCA). The inverse tetragonal MnxYZ Heusler compounds (Y—transition metal and Z—main-group element) stand out as promising materials in this endeavor They attracted much interest for the design of spin-transfer-torque applications, achieving compensated ferrimagnetism, high spin polarization, and a high perpendicular magnetic anisotropy.. They attracted much interest for the design of spin-transfer-torque applications, achieving compensated ferrimagnetism, high spin polarization, and a high perpendicular magnetic anisotropy.2,6–10 They have shown to host vortex-like spin textures, the skyrmions, in a broad temperature and magnetic field range connected to a reorientation of the magnetic moments of the Mn sublattices.. They have shown to host vortex-like spin textures, the skyrmions, in a broad temperature and magnetic field range connected to a reorientation of the magnetic moments of the Mn sublattices.15 These spin textures originate from a competition of the magnetic interactions that, in turn, govern their type and stability. We investigate the temperature dependence of the in-plane (IP) uniaxial anisotropy as well as the out-of-plane (OOP) resonance fields and linewidths in a Mn1.6PtSn film around the spin reorientation transition
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