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MA: Fachverband Magnetismus

MA 27: Focus Session: Magneto-Transport and Magneto-Optics of Higher Orders in Magnetization II

MA 27.3: Vortrag

Mittwoch, 19. März 2025, 15:30–15:45, H18

Strong anisotropy of quadratic magneto-optical Kerr effect in FeRh — •zeynab sadeghi, vladislav wohlrath, jozef kimák, peter kubaščík, eva schmoranzerová, tomas ostatnický, and petr němec — faculty of mathematics and physics, charles university, prauge, 121 16, czech republic

recently, we developed a technique that enables to measure magnetic anisotropy and anisotropy of quadratic magneto-optical Kerr effect (QMOKE) [1]. This technique is based on measurement of magneto-optical response in rotating magnetic field using series of incident light linear polarizations at normal incidence on the sample with a fixed position and, therefore, it can be applied also for samples placed in a cryostat. In this contribution, we report on measurements in FeRh, which is an interesting material with an antiferromagnetic (AFM) ordering at room temperature and a ferromagnetic (FM) phase at temperatures above 400 K. We show that in the FM phase QMOKE has a very strong wavelength-dependent anisotropy in the investigated spectral range from 460 nm to 1600 nm. We also discuss the possibility of investigation of the FeRh AFM phase using this technique. [1] wohlrath, w., sadeghi, z. et al. "quadratic magneto-optical Kerr effect spectroscopy: Polarization variation method for investigation of magnetic and magneto-optical anisotropies." arXiv:2409.20205 (2024).

Keywords: quadratic magneto optical kerr effect (QMOKE); FeRh; magnetic anisotropy; QMOKE anisotropy