Probing the surface magnetism of antiferromagnets
ORAL
Abstract
Using antiferromagnet-ferromagnet spin valves, we detected and studied uncompensated magnetization at the boundary of an antiferromagnetic FeF2(110) layer at different temperatures and magnetic fields. It was discovered that, at low temperatures, this magnetization possesses unprecedented stability, and cannot be reversed even in very high magnetic fields (> 90 kOe). Our experimental technique allowed to detect and characterize the reversal of the boundary magnetization at temperatures close to the Néel temperature, thus, demonstrating the possibility of isothermal imprinting of pining into the antiferromagnet. The boundary magnetization was detected only for the valves with the FeF2(110) layer and not for the valves containing FeF2(100) or FeF2(001). This observation is consistent with symmetry-related theory predicting magnetization at the surface of antiferromagnets with broken time-reversal symmetry. We will show and discuss the experimental results on the valves containing antiferromagnetic Mn2Au whose spin structure can be manipulated electrically.
–
Presenters
-
Ivan Schuller
University of California, San Diego, Dept. of Physics and Center for Advanced Nanoscience, UCSD, La Jolla, CA, USA, Physics Department, University of California, San Diego, Department of Physics, University of California, San Diego
Authors
-
Ivan Schuller
University of California, San Diego, Dept. of Physics and Center for Advanced Nanoscience, UCSD, La Jolla, CA, USA, Physics Department, University of California, San Diego, Department of Physics, University of California, San Diego
-
Pavel N. Lapa
University of California, San Diego
-
Minhan Lee
University of California, San Diego
-
Igor Roshchin
Texas A&M University
-
Kirill Belashchenko
University of Nebraska - Lincoln, University of Nebraska-Lincoln