What we can learn from magnetic Compton scattering: application to the determination of spin polarization

16th International Conference on Positron Annihilation

Duffy, J.A.^1

Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom^1

关键词: Electron momentum densities;    Electron momentum distribution;    Electronic structure calculations;    High energy X ray;    Magnetic Compton profiles;    Magnetic Compton scattering;    Momentum density;    Spintronic materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012011/pdf
DOI  :  10.1088/1742-6596/443/1/012011

来源: IOP

【 摘 要 】

Studies of spin-resolved electron momentum densities involve the measurement of the so-called magnetic Compton profile. This is a one-dimensional projection of the electron momentum distribution of only those electrons that contribute to the spin moment of a sample. The technique is applicable to ferri- and ferromagnetic materials. The profile is obtained via the inelastic 'Compton' scattering of high energy X-rays. Since electrons originating from different atomic orbitals have specific momentum densities, it is often possible to determine the origin of the magnetism present. Typically, interpretation requires the use of electronic structure calculations using molecular orbital and band structure approaches. Here, we highlight the application of the technique to the determination of the Fermi level spin polarization, the knowledge of which is important to the development of novel spintronic materials.