86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019;
Wrightsville Beach, North Carolina
Session G01: Low-dimensional Materials and Magneto-optics
2:00 PM–4:00 PM,
Friday, November 8, 2019
Holiday Inn Resort
Room: Causeway/Masonboro
Chair: Jian Liu, University of Tennessee
Abstract: G01.00002 : Chirality-induced spin-Hall magnetoresistance in 2D chiral hybrid perovskites
2:30 PM–3:00 PM
Preview Abstract
Abstract
Author:
Dali Sun
(North Carolina State University)
2D ferromagnetism is an emerging field in spintronics applications. The use of generic 2D
ferromagnetic materials, however, suffers of the so-called ‘superparamagnetic limit’, which
imposes restrictions on the size and dimension of the ferromagnetic component used in
spintronics devices. The recent discovery of the Chiral-Induced Spin Selectivity (CISS) effect
offers a possibility to generate spin angular momentum by replacing the ferromagnetic
component with chiral systems, e.g., chiral (left- or right-handed) molecules and their assemblies
lacking inversion symmetry. As a result of the CISS effect, the chiral materials can produce an
effective magnetic field at room temperature, which direction is determined by the left or right
chirality, circumventing the ‘superparamagnetic limit’. Here, we report the observation of a large
chiral-induced magnetic field up to 4 Tesla in solution-processed, 2D-layered, organic-inorganic
hybrid perovskites incorporating chiral molecule ligands. Such chiral-induced magnetic field is
probed by measuring the resistance through an attached platinum layer, analogous with the spin-
Hall magnetoresistance (SMR). We found a substantial angular dependent chirality-induced
SMR that agrees well with theoretical models. By sweeping the magnetic field, the SMR reveals
a clear hysteresis depending upon the chirality of 2D perovskites, which could be used to
quantify the effective magnetic field strength produced via the CISS effect. Incorporating the
chiral molecules into a 2D layered hybrid perovskite framework offers a versatile platform for
designing 2D ferromagnetic materials at room temperature. \\
\\ In collaboration with: Eric Vetter, North Carolina State University, Yan Liang, University of North Carolina at Chapel Hill, Yuzan Xiong, Oakland University, Shulei Zhang, Zhizhi Zhang, Oakland University, Yi Li, Oakland University and Argonne National Laboratory, Hongwei Qu, Oakland University, Valentine Novosad, Axel Hoffmann, Argonne National Laboratory, Wei You, University of North Carolina at Chapel Hill, Wei Zhang, Oakland University. \\
Acknowledgement: E.V. and D.S. were thankful for the start-up support provided by North
Carolina State University and NC State-Nagoya Collaboration Grant. Work at Oakland
University was supported by AFOSR under no. FA9550-19-1-0254. Work at Argonne was
supported by the Department of Energy, Office of Science, Materials Science and Engineering
Division.