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Magnetism Modified by Topology

What Has Been Achieved:

The experiment demonstrates the modification of the magnetic properties of a ferrimagnetic insulator, YIG, by juxtaposition with topological surface states in Bi2Se3 .

Importance of the Achievement:

This is the first example of how topological surface states in one material can influence the magnetic properties of another material.

Unique Feature(s) of the MIP that Enabled this Achievement:

2DCC-MIP’s MBE growth of good quality, wafer-scale Bi2Se3 and (Bi,In)2Se3 films on ferrimagnetic insulator substrates. The 2DCC highly integrated vacuum environment that links two MBE systems and an ARPES chamber was crucial to getting this project to completion.

Publication: Tao Liu, James Kally, Timothy Pillsbury, Chuanpu Liu, Houchen Chang, Jinjun Ding, Yang Cheng, Maria Hilse,2

Roman Engel-Herbert, Anthony Richardella, Nitin Samarth, and Mingzhong Wu, Physical Review Letters 125, 017204 (2020) DOI: 10.1103/PhysRevLett.125.017204

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (DE- SC0018994). The fabrication and characterization of the measurement samples were supported mainly by the U.S. National Science Foundation (EFMA-1641989; ECCS- 1915849). Work at P.S.U. was supported by the Penn State Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) funded by the U.S. National Science Foundation (DMR-1539916).

Tao Liu, Mingzhong Wu (Colorado State); Tim Pillsbury, Maria Hilse, Anthony Richardella, Roman Engel Herbert, Nitin Samarth (2DCC, Penn State)
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