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Physics & Astronomy Colloquium – Fall 2019 – Cheng

December 11 @ 8:00 am - 5:00 pm

Speaker: Ran Cheng (University of California, Riverside)

Title: Antiferromagnetic Spintronics – A New Twist in Ultrafast Materials

Abstract: In the past decade, antiferromagnetic materials rapidly emerged as a new frontier in materials science because they can be operated at the Terahertz frequency range, opening a new pathway towards ultrafast materials. However, a pivotal but less known physical characteristic of antiferromagnets is that the spin-wave excitations (or magnons) allow for an intrinsic degree of freedom – chirality – to encode information. This unique feature enables a plethora of intriguing physical phenomena and novel device concepts that are impossible in traditional ferromagnetic systems. In a generic manner, I will introduce recent discoveries and research highlights in antiferromagnetic spintronics including electrical generation of coherent Terahertz signals, thermal control of spin current, magnon-induced interactions, and so on. Particularly, I will reveal that the non-trivial physical behavior of antiferromagnets is related to magnons, which are charge neutral quasi-particles that can transport spin angular momenta over long distances without incurring Joule heating. Antiferromagnetic spintronics not only enables a vibrant playground for new fundamental physics, but also initiates a new twist in ultrafast magnetic materials.

Bio: Dr. Ran Cheng obtained his PhD in condensed matter physics from the University of Texas at Austin in 2014, after which he became a postdoctoral researcher at Carnegie Mellon University. He joined UC Riverside as a faculty member of ECE and Physics in 2018. His research centers on spintronics, magnetism, and magnetic materials. He studies both fundamental physics and innovative applications arising from the interplay between spin, charge, mechanical, and thermal transport phenomena in a wide variety of magnetic materials, especially antiferromagnetic thin films and nanostructures.

Details

Date:
December 11
Time:
8:00 am - 5:00 pm
Event Categories:
,
Website:
https://physics.ua.edu/recent-events/colloquia/

Venue

227 Gallalee Hall
514 University Blvd.
Tuscaloosa, AL 35401 United States
Website:
physics.ua.edu

Organizer

Karen Lynn