Local Photothermal Control of Phase Transitions for On-demand Room-temperature Rewritable Magnetic Patterning
arXiv:1906.07239 · doi:10.1002/adma.202001080
Abstract
The ability to make controlled patterns of magnetic structures within a nonmagnetic background is essential for several types of existing and proposed technologies. Such patterns provide the foundation of magnetic memory and logic devices, allow the creation of artificial spin-ice lattices and enable the study of magnon propagation. Here, we report a novel approach for magnetic patterning that allows repeated creation and erasure of arbitrary shapes of thin-film ferromagnetic structures. This strategy is enabled by epitaxial FeRh thin films designed so that both ferromagnetic and antiferromagnetic phases are bistable at room temperature. Starting with the film in a uniform antiferromagnetic state, we demonstrate the ability to write arbitrary patterns of the ferromagnetic phase by local heating with a focused laser. If desired, the results can then be erased by cooling with a thermoelectric cooler and the material repeatedly re-patterned.
arXiv comment3 figures, 5 pages
References in corpus (9)
- Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
- Room-temperature antiferromagnetic memory resistor
- Colloquium: Artificial spin ice: Designing and imaging magnetic frustration
- Structural and magnetic dynamics of a laser induced phase transition in FeRh
- Impact of lattice dynamics on the phase stability of metamagnetic FeRh: Bulk and thin films
- Higher order exchange interactions leading to metamagnetism in FeRh
- The temperature dependence of FeRh's transport properties
- Imaging uncompensated moments and exchange-biased emergent ferromagnetism in FeRh thin films
- Discovery of Ordered Vortex Phase in Multiferroic Oxide Superlattices