Local manipulation of metamagnetism by strain nanopatterning

Abstract

Our work demonstrates the local enhancement of antiferromagnetic phase stability in FeRh films by strain nanopatterning.

Determination of sub-ps lattice dynamics in FeRh thin films

“…Ab initio calculations have shown the ground states of the AF and FM magnetic ordering to be close in energy 5 , 6 , which means that small perturbations of the system can change the transition temperature 7 . These modelling results have been extensively demonstrated in experiments where it has been found that the transition behaviour can be altered by doping 8 , interfacial strain mediation 9 , 10 , applied voltage 11 , applied stress 12 , applied field 13 , nanoscale patterning 14 , or ion implantation 15 , 16 , among other methods. As part of the coupled phase transition shown in Fig.…”

Strain-gradient effects in nanoscale-engineered magnetoelectric materials

“…38 FeRh exhibits a metamagnetic transition (from the antiferromagnetic to ferromagnetic state) that can be also tuned by the strain gradient (i.e., a direct spatial correlation between the metamagnetic transition temperature of this alloy and local strain values has been recently reported). 39 The flexoelectric effects induced by nanoindentation in multiferroic materials could give rise to changes in the magnetic properties (i.e., to give flexomagnetism). The changes in the magnetic behavior of materials caused by inhomogeneous FE polarization have been sometimes referred to as flexomagnetoelectric effects.…”

Mechanical and Magnetic Properties of Double Layered Nanostructures of Tin and Zirconium Oxides Grown by Atomic Layer Deposition

“…Complementarily, optical transparency may herewith be achieved if the films would possess nanocrystalline nature [ 1 ]. Magnetization performance may in such materials become directly affected by local changes in mechanical strain and stress [ 5 , 6 , 7 ]. In this regard, nanoindentation studies on hardness and elasticity are relevant, especially when considering the materials for applications like magnetic recording, where mechanical properties of the recording medium and reading head surface become important.…”

“…In the latter article, the authors admit that to measure directly only the thin film properties, they should be able to measure properties at a nanoindenter tip displacement of 7 nm or below to avoid substrate influence and this task probably cannot be fulfilled. Due to developments in measurement techniques and technology in recent years, the possibility to mechanically characterize ultra-thin films on a substrate has almost become a viable option [ 1 , 2 , 3 , 5 , 7 ].…”