Magneto-optical properties of REIG and REIG/chiral-perovskite heterostructures

Yu-Jou Shih^1*, Shi-Yu Liu¹, Lan Sheng Yang¹, Ssu-Yen Huang², Yu-Chiang-Chao¹, Fang-Yuh Lo¹

¹Physics, National Taiwan Normal University, Taipei, Taiwan
²Physics, National Taiwan University, Taipei, Taiwan

* Presenter:Yu-Jou Shih, email:seed7400600@gmail.com

In this study, various Rare-earth iron garnet (REIG) films were grown on (111)-oriented
YAG substrates by pulsed-laser deposition, and chiral perovskite materials were spincoated on DyIG. Magnetic anisotropy and magneto-optical properties of the thin films
were investigated at room temperature. In-plane magnetic anisotropy (IMA) was
observed only from YIG, and perpendicular magnetic anisotropy (PMA) was
observed from other REIGs. Magneto-optical Faradaic effect (MOFE) was first
studied for wavelengths between 300 and 600 nm between ±0.8 T, and strong MOFE
was observed for wavelengths smaller than 500 nm. Then absorption spectra and
circular dichroism (CD) were measured for wavelengths between 200 and 600 nm at
magnetic fields of 0, ±0.1, and ±1.6 T, respectively, and the g-factor was then
determined using the CD and absorbance values. The difference in CD spectra is
attributed to different band transitions in REIGs. Thin films with PMA have also
larger CD at the magnetic field strength of 1.6 T. Moreover, absorption spectra and
CD were utilized to study the proximity effect between chiral perovskite and DyIG
layers. The difference in CD and g-factor were observed for different chirality of
perovskite/DyIG heterostructures

Keywords: REIG/chiral-perovskite heterostructures, magnetic anisotropy, Magneto-optical properties