Magnetic ordering and its influence on X-ray spectroscopies

DOI: 10.1107/S1574870722001628

Authors: Gerrit Van Der Laan (Diamond Light Source) , Adriana I. Figueroa (Universitat de Barcelona; Institut de Nanociència i Nanotecnologia)
Co-authored by industrial partner: No

Type: Book Chapter

State: Published (Approved)
Published: December 2020

Abstract: X-ray absorption (XA) spectroscopy enables us to probe the electronic structure and magnetic ordering in, for example, thin-film systems. The photon–matter interaction contains both nonresonant and resonant terms, but only the latter have a strong sensitivity to the spin and orbital moments of the valence shell. Selection rules in XA provide us with a probe to study the local magnetic ground state. The branching ratio of the spin–orbit split core-level spectra is proportional to the ground-state spin–orbit interaction and can also provide a measure of the spin state. The angular dependence of the X-ray magnetic circular dichroism (XMCD) can be described as a sum over an isotropic and an anisotropic contribution, where the latter is linearly proportional to the axial distortion due to strain. The anisotropic properties of magnetic materials are essential to maintain the preferred magnetization direction. These properties, such as the magneto-crystalline anisotropy energy (MAE), have their origin in the orbital moment anisotropy, which can be studied element-specifically using angular-dependent XMCD. Alternatively, the MAE can also be studied using X-ray magnetic linear dichroism (XMLD).

Journal Keywords: magnetism; branching ratio; angular dependence; magnetocrystalline anisotropy energy

Subject Areas: Physics


Technical Areas: Theoretical Physics

Added On: 16/01/2023 10:37

Documents:
qy5022.pdf

Discipline Tags:

Physics Magnetism Theoretical Physics

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