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Larysa Tryputen: Spin Dynamics in Nanoscale Devices and Materials

Wanneer:do 05-04-2018 11:00 - 12:00
Waar:5173.0045

We live in the era of information and social networks. Though enormous amount of information can already be generated and stored, the growing market demand for high-density, low power and high-speed data processing asks for fundamental research on new materials with unprecedented performances, novel experimental paradigms, and efficient and

scalable data processing methods which can satisfy that demand. Spintronic devices have a great potential for realizing next-generation computing. However, few key challenges must be addressed, to implement these devices and make them an integral part of computing. More specifically, we need: 1) to further understand mechanisms to achieve efficient control of spin transport and spin configurations in thin films and nanostructures; 2) to solve scalability problem, and 3) to overcome the most serious problem in modern electronics - energy dissipation.

In this talk, I will review the main distinctive features of these three challenges and suggest how they can be addressed. I will first introduce the phonon spectroscopy, that can act as in situ nanometer-scale probe to study spin dynamics as well as phonon structure in magnetic point contacts. Then I will demonstrate scaling and switching behaviour of magnetic tunnel junctions with perpendicular anisotropy with a structure of Ta/CoFeB/MgO/CoFeB/Ta (Mo) of diameters < 50 nm. Finally, I will conclude by demonstrating the formation, annihilation and dissociation of 360 degrees magnetic domain walls in nanodevices.