Magnetization transport across a ferromagnetic-paramagnetic interface

• Published in: Physical review. B, Condensed matter Condensed matter, 1987-04, Vol.35 (10), p.5198-5208
• Main Authors: SPARKS, P. D, SILSBEE, R. H
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conduction electrons; Cross-disciplinary physics: materials science; rheology; Electron paramagnetic resonance and relaxation; Exact sciences and technology; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Materials science; Metals, semimetals and alloys; Other topics in magnetic properties and materials; Physics; Specific materials
• ISSN: 0163-1829; 1095-3795
• DOI: 10.1103/PhysRevB.35.5198

The transport of magnetization across a metallic ferromagnetic--paramagnetic bilayer is investigated using electron spin resonance. The ferromagnetic resonance and transmission electron spin resonance of films of Pd--Fe alloys (Pd sub 100--x Fe sub x , 0.5 < = x < = 4) on Cu foils are measured. The data are analyzed using a phenomenological model with two proposed mechanisms to couple the magnetizations in the film and the Cu. One mechanism is the diffusion of electrons across the interface; the other is an exchange torque across the interface. The dominant coupling mechanism is found to be diffusion of electrons. The model, in addition, accounts well for the angular variation of the spin resonance signal at a fixed temperature. Finally, it describes moderately well the variations with temperature of the spin resonance signal over the temperature range in which the magnetization and ferromagnetic resonance linewidth of the ferromagnetic film are varying dramatically. 24 ref.--AA