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Reversible optical control of magnetism in engineered artificial multiferroics
Diego A Ochoa1, Enric Menéndez2, Jesús López-Sánchez3
1Departament de Física, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain. jose.eduardo.garcia@upc.edu.
Nanoscale
|February 7, 2024
Summary
Researchers demonstrated reversible optical control of magnetism at room temperature in Fe75Al25/BaTiO3 heterostructures. This breakthrough enables low-power, wireless magneto-optical devices for next-generation spintronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Optical control of magnetism offers a low-power, wireless alternative to electric fields for spintronic devices.
- Artificial multiferroic materials are promising platforms for optical magnetic control.
- Stable, reversible, room-temperature magnetic modulation is crucial for practical applications.
Purpose of the Study:
- To demonstrate reversible, room-temperature optical modulation of magnetism in Fe75Al25/BaTiO3 heterostructures.
- To investigate the underlying mechanism of light-induced magnetic reorientation.
- To explore the potential for developing novel magneto-optical devices.
Main Methods:
- Fabrication of Fe75Al25/BaTiO3 heterostructures with specific ferroelectric domain arrangements.
- Application of low-intensity visible light to induce changes in magnetic properties.
- Characterization of magnetic properties using techniques like hysteresis loop measurements.
Main Results:
- Achieved unprecedented reversible modulation of magnetism using visible light at room temperature.
- Observed a 90-degree reorientation of the magnetic easy axis due to light-induced anisotropic stress from ferroelectric domain switching.
- Demonstrated significant light-induced changes in coercivity and squareness ratio.
Conclusions:
- Fe75Al25/BaTiO3 heterostructures with oriented charged domain walls enable efficient optical control of magnetism.
- The observed phenomenon is driven by light-actuated ferroelectric domain switching and resulting stress.
- This work paves the way for developing low energy-consumption, wireless magneto-optical devices.
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