Detection of uncompensated magnetization at the interface of an epitaxial antiferromagnetic insulator
Abstract
We have probed directly the temperature and magnetic field dependence of pinned uncompensated magnetization at the interface of antiferromagnetic FeF2 with Cu, using FeF2-Cu-Co spin valves. Electrons polarized by the Co layer are scattered by the pinned uncompensated moments at the FeF2-Cu interface giving rise to giant magnetoresistance. We determined the direction and magnitude of the pinned uncompensated magnetization at different magnetic fields and temperatures using the angular dependencies of resistance. The strong FeF2 anisotropy pins the uncompensated magnetization along the easy axis independent of the cooling field orientation. Most interestingly, magnetic fields as high as 90 kOe cannot break the pinning at the FeF2-Cu interface. This proves that the pinned interfacial magnetization is strongly coupled to the antiferromagnetic order inside the bulk FeF2 layer. Studies as a function of FeF2 crystalline orientation show that uncompensated spins are only detected in a spin valve with (110) crystal orientation, but not in valves containing FeF2(100) and FeF2(001). This observation is in agreement with symmetry-related considerations which predict the equilibrium boundary magnetization for the FeF2(110) layer.
- Authors:
-
- Univ. of California San Diego, La Jolla, CA (United States)
- Texas A & M Univ., College Station, TX (United States)
- Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center of Materials and Nanoscience
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1849979
- Grant/Contract Number:
- FG02-87ER45332; DMR-1609776; DMR-1420645
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 17; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Materials Science; Physics; Antiferromagnetism; Giant magnetoresistance; Magnetotransport; Spintronics; Interfaces; Spin valves; T-symmetry
Citation Formats
Lapa, Pavel N., Lee, Min-Han, Roshchin, Igor V., Belashchenko, Kirill D., and Schuller, Ivan K. Detection of uncompensated magnetization at the interface of an epitaxial antiferromagnetic insulator. United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.174406.
Lapa, Pavel N., Lee, Min-Han, Roshchin, Igor V., Belashchenko, Kirill D., & Schuller, Ivan K. Detection of uncompensated magnetization at the interface of an epitaxial antiferromagnetic insulator. United States. https://doi.org/10.1103/physrevb.102.174406
Lapa, Pavel N., Lee, Min-Han, Roshchin, Igor V., Belashchenko, Kirill D., and Schuller, Ivan K. Thu .
"Detection of uncompensated magnetization at the interface of an epitaxial antiferromagnetic insulator". United States. https://doi.org/10.1103/physrevb.102.174406. https://www.osti.gov/servlets/purl/1849979.
@article{osti_1849979,
title = {Detection of uncompensated magnetization at the interface of an epitaxial antiferromagnetic insulator},
author = {Lapa, Pavel N. and Lee, Min-Han and Roshchin, Igor V. and Belashchenko, Kirill D. and Schuller, Ivan K.},
abstractNote = {We have probed directly the temperature and magnetic field dependence of pinned uncompensated magnetization at the interface of antiferromagnetic FeF2 with Cu, using FeF2-Cu-Co spin valves. Electrons polarized by the Co layer are scattered by the pinned uncompensated moments at the FeF2-Cu interface giving rise to giant magnetoresistance. We determined the direction and magnitude of the pinned uncompensated magnetization at different magnetic fields and temperatures using the angular dependencies of resistance. The strong FeF2 anisotropy pins the uncompensated magnetization along the easy axis independent of the cooling field orientation. Most interestingly, magnetic fields as high as 90 kOe cannot break the pinning at the FeF2-Cu interface. This proves that the pinned interfacial magnetization is strongly coupled to the antiferromagnetic order inside the bulk FeF2 layer. Studies as a function of FeF2 crystalline orientation show that uncompensated spins are only detected in a spin valve with (110) crystal orientation, but not in valves containing FeF2(100) and FeF2(001). This observation is in agreement with symmetry-related considerations which predict the equilibrium boundary magnetization for the FeF2(110) layer.},
doi = {10.1103/physrevb.102.174406},
journal = {Physical Review. B},
number = 17,
volume = 102,
place = {United States},
year = {Thu Nov 05 00:00:00 EST 2020},
month = {Thu Nov 05 00:00:00 EST 2020}
}
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