Tunable magnetization relaxation of Fe_{2}Cr_{1-x}Co_{x}Si half-metallic Heusler alloys by band structure engineering
arXiv:1711.00406 · doi:10.1103/PhysRevMaterials.1.064401
Abstract
We report a systematic investigation on the magnetization relaxation properties of iron-based half-metallic Heusler alloy FeCrCo_Si (FCCS) thin films using broadband angular-resolved ferromagnetic resonance. Band structure engineering through Co doping (x) demonstrated by first-principles calculations is shown to tune the intrinsic magnetic damping over an order of magnitude, namely 0.01-0.0008. Notably, the intrinsic damping constants for samples with high Co concentration are among the lowest reported for Heusler alloys and even comparable to magnetic insulator yttrium iron garnet. Furthermore, a significant reduction of both isotropic and anisotropic contributions of extrinsic damping of the FCCS alloys was found in the FCCS films with x=0.5-0.75, which is of particular importance for applications. These results demonstrate a practical recipe to tailor functional magnetization for Heusler alloy-based spintronics at room temperature
6figures
References in corpus (7)
- Half-metallic ferromagnets: From band structure to many-body effects
- Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
- Low relaxation rate in a low-Z alloy of iron
- A 4-fold-symmetry hexagonal ruthenium for magnetic heterostructures exhibiting enhanced perpendicular magnetic anisotropy and tunnel magnetoresistance
- Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy
- Tunnel magnetoresistance and spin-transfer-torque switching in polycrystalline Co2FeAl full-Heusler alloy magnetic tunnel junctions on Si/SiO2 amorphous substrates
- Half-metallicity and anisotropy magnetoresistance properties of Heusler alloys Fe2Co1-xCrxSi