Light-induced optical orientation of magnetic moments in transition-metal doped hybrid metal halide perovskites

• Main Authors: Bodnar, Stanislav, Zerhoch, Jonathan, Liu, Shangpu, Shcherbakov, Andrii, Heindl, Markus W, Sapozhnik, Alexey, Deschler, Felix
• Format: Journal Article
• Language: English
• Published: 27-06-2024
• Subjects: Physics - Applied Physics; Physics - Materials Science
• DOI: 10.48550/arxiv.2406.19127

Using optical orientation to manipulate magnetic moments in matter with light
is a key objective in opto-spintronics, however, realizations of such control
on ultrafast timescales are limited. Here, we report ultrafast optical control
of magnetic moment orientation in magnetically doped metal halide perovskites.
Employing intense pulses of circularly polarized light, we inject populations
of spin-polarized charge carriers in pristine and manganese-doped MAPbBr3 thin
films. Using transient Faraday rotation spectroscopy, we probe the ultrafast
magnetic moment dynamics following photoexcitation and find that light-induced
magnetization in doped samples is increased by a factor of 10. We attribute
this to photoexcited carriers acting on the magnetic moments of manganese
dopant-ions via the sp-d exchange interaction, which forces them to align on
picosecond timescales. Our findings open new avenues for device structures that
use hybrid metal halide perovskites for ultrafast optical manipulation and
read-out of magnetic order with the potential for high switching rates.