FWI Institutskolloquium: Nanomagnetic Playground: Magnetic Skyrmions, Magneto-Ionics and HAMR Media

Datum

23.08.2017

Zeit

10:30 - 12:00

Sprecher

Prof. Kai Liu

Zugehörigkeit

Experimental Condensed Matter Physics, Physics Department/UC Davis

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

Prof. Jürgen Fassbender (3096), Susann Gebel (2345)

Beschreibung

Abstract: The coming end of Moore’s law underscores the need for transformative new approaches beyond the complementary metal-oxide semiconductor (CMOS) technology. Nanomagnetics and Spintronics offer an exciting new paradigm to address this grand challenge. For example, in recently discovered magnetic skyrmions, mostly at low temperatures, the unique spin texture and the topologically protected quantum state offer great potentials for low dissipation magnetic information storage. We have recently demonstrated the realization of room temperature artificial Bloch skyrmion lattices in their ground state [1]. In a second area, we have demonstrated effective magneto-ionic manipulation of metal/oxide interfaces due to a redox-driven oxygen migration, manifested through the interface-sensitive exchange bias effect [2] and controllable under an electric field [3]. Another example, much closer to technological adaptation, is the use of high magnetic anisotropy materials for the emerging heat-assisted magnetic recording (HAMR). We have developed a magnetometry-based order parameter to probe the phase transformation of high anisotropy L10 FePt films [4], and found an extremely sensitive magnetic yoking effect to tailor magnetic interactions at the nanoscale [5]. These results show promise towards future spin-based nanoelectronics and information storage. 1. Nature Communications 6, 8462, (2015). 2. Nature Communications 7, 11050 (2016). 3. Nature Communications 7, 12264 (2016). 4. APL Materials 2, 086106 (2014). 5. Scientific Reports 6, 32842 (2016).

Letztmalig verändert: 23.08.2017, 09:57:26