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Unaltered reversible magnetic transition in Fe nanostructures upon ambient exposure
A Quesada1, R Gargallo-Caballero2, Y Montaña2
1Instituto de Cerámica y Vidrio (CSIC), Madrid 28049, Spain.
Ultramicroscopy
|May 20, 2017
Summary
High aspect-ratio iron nanostrips exhibit magnetic bistability, switching between single-domain and multidomain states with temperature. Surface oxidation affects this magnetic behavior, crucial for potential logic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- High aspect-ratio iron (Fe) nanostrips display temperature- and width-dependent magnetic bistability.
- This phenomenon arises from the interplay of magnetocrystalline, shape, and magnetoelastic anisotropies.
- Potential applications exist in magnetic logic devices, but oxidation of Fe nanostructures is a concern.
Purpose of the Study:
- To investigate the magnetic behavior of thin Fe nanostrips.
- To understand the impact of air exposure and surface oxidation on magnetic anisotropy.
- To analyze magnetic state switching before and after oxidation.
Main Methods:
- Utilized x-ray magnetic circular dichroism-photoemission electron microscopy (XMCD-PEEM).
- Studied thin Fe nanostrips.
- Compared magnetic states of nanostrips before and after air exposure.
Main Results:
- Observed reversible switching between single-domain and multidomain states in Fe nanostrips.
- Demonstrated that surface oxidation significantly influences the anisotropy balance.
- Characterized the magnetic domain patterns before and after air exposure.
Conclusions:
- The magnetic bistability of Fe nanostrips is sensitive to surface conditions.
- Oxidation alters the magnetic anisotropy, impacting the observed domain structures.
- Understanding these effects is vital for the application of Fe nanostructures in spintronic devices.
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