skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure

Journal Article · · APL Materials
DOI:https://doi.org/10.1063/1.5001318· OSTI ID:1501548
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [2];  [3];  [1]
  1. Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy
  2. National Inst. for Materials Science (NIMS), Tsukuba (Japan). Advanced Materials Lab.
  3. Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy; The Ohio State Univ., Columbus, OH (United States). Dept. of Physics

Quantum anomalous Hall state is expected to emerge in Dirac electron systems such as graphene under both sufficiently strong exchange and spin-orbit interactions. In pristine graphene, neither interaction exists; however, both interactions can be acquired by coupling graphene to a magnetic insulator as revealed by the anomalous Hall effect. Here, we show enhanced magnetic proximity coupling by sandwiching graphene between a ferrimagnetic insulator yttrium iron garnet (YIG) and hexagonal-boron nitride (h-BN) which also serves as a top gate dielectric. By sweeping the top-gate voltage, we observe Fermi level-dependent anomalous Hall conductance. As the Dirac point is approached from both electron and hole sides, the anomalous Hall conductance reaches ¼ of the quantum anomalous Hall conductance 2e2/h. The exchange coupling strength is determined to be as high as 27 meV from the transition temperature of the induced magnetic phase. YIG/graphene/h-BN is an excellent heterostructure for demonstrating proximity-induced interactions in two-dimensional electron systems.

Research Organization:
Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-07ER46351; SC0010597; 1202559; 1610447
OSTI ID:
1501548
Alternate ID(s):
OSTI ID: 1406647
Journal Information:
APL Materials, Vol. 6, Issue 2; ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

References (20)

Strong interfacial exchange field in the graphene/EuS heterostructure journal March 2016
Room-Temperature Spin Memory in Two-Dimensional Electron Gases journal August 1997
Layer-by-layer growth and magnetic properties of Y3Fe5O12 thin films on Gd3Ga5O12 journal December 2009
Tunable spin–orbit coupling and symmetry-protected edge states in graphene/WS 2 journal September 2016
Optical studies of locally implanted magnetic ions in GaAs journal July 1994
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals journal April 2017
Above 400-K robust perpendicular ferromagnetic phase in a topological insulator journal June 2017
Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator journal March 2013
Direct comparison of graphene devices before and after transfer to different substrates journal January 2014
Proximity-Induced Ferromagnetism in Graphene Revealed by the Anomalous Hall Effect journal January 2015
Exquisite growth control and magnetic properties of yttrium iron garnet thin films journal March 2016
One-Dimensional Electrical Contact to a Two-Dimensional Material journal October 2013
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit journal June 2017
Strong interface-induced spin–orbit interaction in graphene on WS2 journal September 2015
Electric field effect in multilayer Cr 2 Ge 2 Te 6 : a ferromagnetic 2D material journal May 2017
Boron nitride substrates for high-quality graphene electronics journal August 2010
Spin Transport and Localization in a Magnetic Two-Dimensional Electron Gas journal May 1997
An integrated approach to doped thin films with strain-tunable magnetic anisotropy: powder synthesis, target preparation and pulsed laser deposition of Bi:YIG journal July 2016
Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases journal August 1998
Magneto-elastic coupling in a potential ferromagnetic 2D atomic crystal journal June 2016

Cited By (10)

Substrate induced nanoscale resistance variation in epitaxial graphene journal January 2020
Possible realization of the high-temperature and multichannel quantum anomalous Hall effect in graphene/CrBr 3 heterostructures under pressure journal January 2019
Recent advances in two-dimensional ferromagnetism: materials synthesis, physical properties and device applications journal January 2020
Cyclotron motion without magnetic field journal August 2019
Magnetic proximity in a van der Waals heterostructure of magnetic insulator and graphene journal December 2019
Probing magnetism via spin dynamics in graphene/2D-ferromagnet heterostructures journal September 2019
Anomalous Hall Effect in 2D Dirac Materials journal September 2018
Magnetic proximity in a van der Waals heterostructure of magnetic insulator and graphene text January 2019
Substrate induced nanoscale resistance variation in epitaxial graphene text January 2020
Substrate induced nanoscale resistance variation in epitaxial graphene text January 2019

Figures / Tables (4)