| AVS 66th International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures Division | Wednesday Sessions |
| Session MI+2D-WeA |
| Session: | Emerging Multifunctional Magnetic Materials II |
| Presenter: | Vojtech Uhlir, CEITEC BUT, Brno University of Technology, Czech Republic |
| Correspondent: | Click to Email |
The advantage of ferromagnetic materials is the nonvolatility of the information encoded in the internal magnetic configuration, which can be used for memory storage, logic and sensing devices. Antiferromagnets are another class of magnetic materials that features nonvolatile magnetic ordering, yet its applications have been largely overlooked until recently [1]. In materials featuring a first-order metamagnetic phase transition between the antiferromagnetic (AF) and ferromagnetic (FM) states, the nature of the phase transition can be tuned by strain, pressure, chemical doping, temperature, as well as magnetic and electric fields, potentially offering very high recording densities and huge changes in the order parameters controlled with very low power.
Moreover, metamagnetic materials are outstanding candidates for finding and exploiting new functionalities and emergent phenomena on the mesoscale [2,3]. For instance, the transition from the AF order to FM order in sub-micron-wide FeRh wires becomes greatly asymmetric when comparing the heating and cooling cycles [3,4]. This recovery of the abrupt transition in nanostructures could lead to low-energy, efficient routes to control magnetic properties, leading to potential applications, for instance, in spintronics.
Furthermore, we show the dynamic response of the electronic and magnetic order to ultrafast laser excitation can be followed by time-resolved photoemission electron spectroscopy [5], which unlike techniques probing the total magnetization in the sample provides a direct comparison to the dynamic response of the structural order.
[1] T. Jungwirth, X. Marti, P. Wadley, and J. Wunderlich, Nature Mater.11, 231 (2016).
[2] F. Pressacco et al., Sci. Rep.6, 22383 (2016).
[3] V. Uhlíř, J. A. Arregi, and E. E. Fullerton, Nat. Commun.7, 13113 (2016).
[4] J. A. Arregi et al.,J. Phys. D: Appl. Phys.51, 105001 (2018).
[5] F. Pressacco et al., Struct. Dyn. 5, 034501 (2018).