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MA: Fachverband Magnetismus

MA 43: Magnetic Semiconductors, Magnetization Dynamics and Damping

MA 43.4: Vortrag

Donnerstag, 21. März 2024, 15:45–16:00, EB 202

Light-induced alignment of Mn spins in hybrid metal halide perovskite matrix — •Stanislav Bodnar, Jonathan Zerhoch, Shangpu Liu, Andrii Shcherbakov, and Felix Deshcler — Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany

Hybrid organic-inorganic metal-halide perovskites (HOIPs) are prospective semiconductor materials for a new generation of solar cells and light emission diodes (LEDs) as well as a new class of material for data storage applications. In our work, we investigated highly Mn-doped MAPbBr3 (MA=methylamine) with a nominal doping level of Mn2+ at the level of 50%. The incorporation of Mn atoms has led to the presence of a new paramagnetic state of the Mn-doped material without forming a ferromagnetic or antiferromagnetic spin order. Our studies have revealed that the transient Faraday signal in the Mn-doped sample is 3 times higher than in the case of undoped MAPbBr3. We attribute this additional Faraday signal in the Mn-doped sample to the magnetic moments associated with Mn spins which are aligned by an effective magnetic field caused by light-induced spin-polarized charge carriers. Additionally, we discovered that the presence of Mn atoms in the MAPbBr3 has led not only to the enhanced amplitude of the transient Faraday signal but also to the extended spin lifetime. For the moderate fluence regime of 100 uJ/cm2 spin lifetime of the Mn-doped sample has been extended by 3 times (15ps) compared to the undoped sample. We attribute this extended spin lifetime to the presence of the additional aligned Mn spins.

Keywords: Spin dynamics; Perovskites; Light induced magnetism; Transient Faraday effect; Magnetic doping