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Spin-polarized transport across sharp antiferromagnetic boundaries
W Eerenstein1, T T M Palstra, S S Saxena
1Material Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Physical Review Letters
|June 13, 2002
Summary
Spin-polarized electrons traverse antiferromagnetic interfaces at antiphase boundaries in iron oxide films. These magnetic interfaces exhibit unique magnetoresistance behavior explained by a hopping model.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Antiphase domain boundaries in epitaxial iron oxide films serve as atomically sharp magnetic interfaces.
- The magnetic coupling across a significant portion of these boundaries is antiferromagnetic, influencing electron transport.
Purpose of the Study:
- To investigate spin-polarized transport phenomena across antiphase domain boundaries.
- To characterize the magnetic and electrical properties of these interfaces.
Main Methods:
- Epitaxial growth of iron oxide (Fe(3)O(4)) on magnesium oxide (MgO).
- Spin-polarized transport experiments, including magnetoresistance measurements.
- Analysis using a hopping model for electron transport.
Main Results:
- Magnetoresistance measurements show distinct linear and quadratic field dependencies.
- These dependencies are observed for magnetic fields applied parallel and perpendicular to the film plane, up to the anisotropy field.
- Experimental data aligns with theoretical predictions of a hopping model.
Conclusions:
- Antiphase domain boundaries act as functional antiferromagnetic interfaces for spin-polarized electrons.
- The observed magnetoresistance is a direct consequence of electron traversal across these interfaces.
- The hopping model effectively explains the spin-polarized transport behavior at these magnetic boundaries.