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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Electric Field Control of Interfacial Ferromagnetism in CaMnO_{3}/CaRuO_{3} Heterostructures
A J Grutter1, B J Kirby1, M T Gray2,3
1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Physical Review Letters
|August 8, 2015
Summary
Researchers demonstrated electric field control of ferromagnetism in CaMnO3/CaRuO3 interfaces. Applying an electric field induced a transition from antiferromagnetism to ferromagnetism, showing potential for spintronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Developing novel methods for electric field control of ferromagnetism is crucial for advanced magnetic interfaces.
- Existing techniques often lack the precision needed for single-layer control.
Purpose of the Study:
- To investigate the electric field dependence of ferromagnetism at CaRuO3/CaMnO3 interfaces.
- To explore the potential for direct electric field manipulation of magnetic properties at the atomic scale.
Main Methods:
- Fabrication of CaRuO3/CaMnO3 bilayers on SrTiO3 substrates.
- Utilized polarized neutron reflectometry to detect ferromagnetic signals from a single CaMnO3 atomic monolayer.
- Applied an electric field of 600 kV/m across the bilayer.
Main Results:
- Detected a ferromagnetic signal from a single atomic monolayer of CaMnO3, evidenced by spin asymmetry.
- Observed a significant increase in spin asymmetry upon electric field application.
- Modeling indicated a transition from canted antiferromagnetism to ferromagnetic alignment of Mn4+ ions, increasing magnetic moment from 1 μB to 2.5-3.0 μB per Mn.
Conclusions:
- Demonstrated strong magnetoelectric coupling at the CaRuO3/CaMnO3 interface.
- Achieved direct electric field control of magnetization in a single atomic layer.
- Highlighted the potential of this interface for future spintronic device applications.
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