Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session W40: Disordered Systems
8:00 AM–11:00 AM,
Friday, March 6, 2020
Room: 705
Sponsoring
Unit:
GMAG
Chair: Tao Qu, University of Minnesota
Abstract: W40.00010 : Demonstration and quantitative characterization of effective random exchange fields in ferromagnet/antiferromagnet bilayers*
Presenter:
Dylan James Collette
(Department of Physics, Emory University)
Authors:
Dylan James Collette
(Department of Physics, Emory University)
Guanxiong Chen
(Department of Physics, Emory University)
Sergei Urazhdin
(Department of Physics, Emory University)
We utilize magnetoelectronic measurements of anisotropic magnetoresistance in Permalloy(Py)/CoO bilayers to confirm the predicted random-field effects and quantify the random field. In particular, we show that the component of magnetization of F perpendicular to the external field scales as a power-law with the exponent dependent on the thickness of Py. Scaling analysis and micromagnetic simulations confirm that these dependences are consistent with the expected effects of random field, and allow us to determine its magnitude. Our results open a route for analyzing and controlling magnetic frustration in heterostructures.
[1] A. Malozemoff, Phys. Rev. B 37, 7673 (1988).
[2] T. Ma, S. Urazhdin, Phys. Rev. B 97, 054402 (2018); S. Urazhdin, W. Li, L. Novozhilova, JMMM 476, 75 (2019).
*This work was supported by the grant # DE-SC2218976 funded by the U.S. DOE Office of Science
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