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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 1997 The American Physical Society
- ISSN
- 1095-3795
- DOI
- 10.1103/PhysRevB.55.11569
- Publisher site
- See Article on Publisher Site
Abstract
The magnetic interlayer coupling between two magnetic layers separated by an insulator was investigated on Co 0.2 Fe 2.8 O 4 / Fe 3 O 4 /MgO/ Fe 3 O 4 samples grown by means of molecular beam epitaxy on (001) MgAl 2 O 4 substrates. The samples were designed to observe interlayer coupling of either sign. Hysteresis loop measurements show that the Fe 3 O 4 layers are ferromagnetically coupled in the thickness range 0–45 nm MgO. Below a MgO spacer thickness of 1.3 nm, the coupling strength increases drastically with decreasing MgO thickness and is ascribed to the existence of ferromagnetic bridges through the MgO spacer. The small ferromagnetic coupling above 1.3 nm seems to arise from a magnetostatic coupling due to correlated interface irregularities.
Journal
Physical Review B – American Physical Society (APS)
Published: May 1, 1997