Spin wave stiffness and exchange stiffness of doped permalloy via ab-initio calculation

Abstract

The way doping affects the spin wave stiffness and the exchange stiffness of permalloy (Py) is investigated via ab-initio calculations, using the Korringa-Kohn-Rostoker (KKR) Green function formalism. By considering various types of dopants of different nature (V, Gd, and Pt), we are able to draw general conclusions. To describe the trends of the stiffness with doping is it sufficient to account for the exchange coupling between nearest neighbors. The polarizability of the impurities is not an important factor for the spin wave stiffness. Rather, the decisive factor is the hybridization between the impurity and the host states as reflected by changes in the Bloch spectral function. Our theoretical results agree well with earlier experiments.

arXiv comment8 figures, 5 tables

References in corpus (9)

• Ab-initio calculations of exchange interactions, spin-wave stiffness constants, and Curie temperatures of Fe, Co, and Ni
• Temperature dependent magnetic properties of FePt: effective spin Hamiltonian model
• Precise determination of the spectroscopic g-factor using broadband ferromagnetic resonance spectroscopy
• Thermal collapse of spin-polarization in half-metallic ferromagnets
• Tunable damping, saturation magnetization, and exchange stiffness of half-Heusler NiMnSb thin films
• Finite-temperature magnetism of Fe${}_x$Pd${}_{1-x}$ and Co${}_x$Pt${}_{1-x}$ alloys
• Electronic and transport properties of the Mn-doped topological insulator Bi${}_2$Te${}_3$: A first-principles study
• A systematic study of magnetodynamic properties at finite temperatures in doped permalloy from first principles calculations
• Local environment effects in the magnetic properties and electronic structure of disordered FePt

Cited by in corpus (8)

• Transport properties of doped permalloy via ab-initio calculations: effect of the host disorder
• Phase Boundary Exchange Coupling in the Mixed Magnetic Phase Regime of a Pd-doped FeRh Epilayer
• Spin-wave dispersion and exchange stiffness in Nd${}_2$Fe${}_{14}$B and $R$Fe${}_{11}$Ti ($R$=Y, Nd, Sm) from first-principles calculations
• Assessing different approaches to ab initio calculations of spin wave stiffness
• Exchange stiffness proportional to power of magnetization in permalloy co-doped with Mo and Cu
• Methods of electron transport in ab initio theory of spin stiffness
• Efficient characteristics of exchange coupling and spin-flop transition in Py/Gd bilayer using anisotropic magnetoresistance
• Multiscale approach for modeling magnetization properties of inhomogeneous ultrathin magnetic layers