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Tuneable exchange-spring stiffness in amorphous magnetic trilayer structures.

F Magnus^1,2, U B Arnalds¹, H Palonen²

¹Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 10, 2021

Summary

This summary is machine-generated.

This study explores magnetic coupling in SmCo/Co(AlZr)/Co(AlZr) exchange-spring magnet trilayers. The coupling strength, controllable by temperature, influences magnetic switching behavior above the spacer layer's Curie temperature.

Keywords:

amorphous exchange-spring magnet interlayer exchange coupling magnetic proximity effect thin film

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Published on: June 7, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Magnetism

Background:

Exchange-spring magnets utilize the coupling between magnetically hard and soft layers for advanced magnetic applications.
Understanding the interfacial coupling mechanisms is crucial for designing high-performance magnetic materials.

Purpose of the Study:

To investigate the magnetic properties and coupling behavior of amorphous Sm$_{10}$Co$_{90}$/Co$_{60}$(Al$_{70}$Zr$_{30}$)$_{40}$/Co$_{85}$(Al$_{70}$Zr$_{30}$)$_{15}$ exchange-spring magnet trilayers.
To explore the temperature dependence of magnetic coupling and its persistence above the spacer layer's Curie temperature.
To analyze the magnetization reversal process and the influence of coupling strength on the soft layer's switching behavior.

Main Methods:

Fabrication of amorphous Sm$_{10}$Co$_{90}$/Co$_{60}$(Al$_{70}$Zr$_{30}$)$_{40}$/Co$_{85}$(Al$_{70}$Zr$_{30}$)$_{15}$ trilayers.
Polarized neutron reflectivity (PNR) measurements to probe the magnetic depth profile.
Variable temperature measurements to study the effect of temperature on magnetic coupling.

Main Results:

A two-step magnetization reversal process was observed in the trilayers.
The switching angle of the magnetically soft Co$_{85}$(Al$_{70}$Zr$_{30}$)$_{15}$ layer is strongly dependent on the coupling strength.
Magnetic coupling persists above the intrinsic Curie temperature (T$_{c}$) of the Co$_{60}$(Al$_{70}$Zr$_{30}$)$_{40}$ spacer layer due to a long-range magnetic proximity effect.
In the strong coupling regime, a perpendicular magnetic state between soft and hard layers can be achieved.

Conclusions:

The magnetic coupling in these exchange-spring trilayers is tunable with temperature and exhibits long-range effects.
The observed magnetic proximity effect allows coupling to persist above the spacer's T$_{c}$, enabling novel magnetic states.
The findings provide insights into controlling magnetization reversal in multilayered magnetic systems for potential applications.