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Light-Controlled Magnetic Properties: An Energy-Efficient Opto-Mechanical Control over Magnetic Films by Liquid
Gabriele Barrera1, Daniele Martella2,3, Federica Celegato1
1Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, Torino, 10135, Italy.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 7, 2024
Summary
Researchers developed a novel method using light to control magnetostrictive materials without physical contact. This opto-mechanical approach enables non-contact control and a unique magnetic memory effect, advancing contactless technologies.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Magnetostrictive materials enable energy conversion but require physical contact or magnetic fields for operation.
- Current limitations hinder miniaturization and integration into contactless devices.
- Developing non-contact control methods is crucial for advanced applications.
Purpose of the Study:
- To achieve non-contact and reversible opto-mechanical control of magnetostrictive materials.
- To overcome limitations of physical contact and magnetic field sources.
- To develop a light-controlled magnetic memory effect.
Main Methods:
- Integration of a magnetostrictive Fe70Ga30 thin film with a photo-responsive Liquid Crystalline Network (LCN).
- Utilizing light wavelength and illumination time to modulate magnetic properties.
- Employing ultraviolet (UV) light for stress induction and visible light for stress release.
Main Results:
- Demonstrated non-contact, light-induced mechanical stress transfer to magnetostrictive materials.
- Achieved reversible opto-mechanical control of magnetic and electrical properties.
- Observed a magnetic memory effect due to stable LCN shape change, erasable with visible light.
Conclusions:
- A novel composite material enables light-controlled, non-contact operation of magnetostrictive devices.
- The developed system exhibits a unique magnetic memory effect with energy efficiency.
- This breakthrough paves the way for fully reconfigurable magnetic systems controlled solely by light.
