Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 33, Issue 44, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ac1c2c
Keywords
exchange-spring magnet; interlayer exchange coupling; amorphous; thin film; magnetic proximity effect
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Funding
- Icelandic Research Fund [174271-051]
- University of Iceland Research Fund
- Swedish Research Council (VR)
- Swedish Research Council
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The passage describes the investigation of the magnetic properties of amorphous exchange-spring magnet trilayers, where the coupling between magnetically soft and hard layers can be controlled through temperature. The experiment shows that a magnetic state can be achieved with perpendicular magnetization of the soft layer in the strong coupling regime.
We investigate the magnetic properties of amorphous Sm10Co90/Co-60(Al70Zr30)(40)/Co-85(Al70Zr30)(15) exchange-spring magnet trilayers. The magnetically soft Co-85(Al70Zr30)(15) layer is coupled to the magnetically hard Sm10Co90 layer through the weakly magnetic low-T (c) Co-60(Al70Zr30)(40) spacer layer. The strength of the coupling can be controlled with temperature and the coupling persists above the intrinsic T (c) of the spacer layer due to a long-range magnetic proximity effect. Polarized neutron reflectivity is used to examine the magnetic profile of the trilayers during magnetization reversal. A two-step switching occurs, with the switching angle of the soft layer strongly dependent on the strength of the coupling. In the strong coupling regime a magnetic state can be achieved where the soft layer magnetization is perpendicular to the hard layer whereas in the weak coupling regime the soft layer reverses fully.
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