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MatSE Hard Materials Seminar

Event Type
Seminar/Symposium
Sponsor
Materials Science and Engineering Department
Date
Nov 5, 2020   4:00 pm  
Speaker
Shaloo Rakheja, Electrical and Computer Engineering Department, University of Illinois at Urbana - Champaign
Views
49
Originating Calendar
MatSE Hard Materials Seminar Calendar

"Cr2O3-based energy-efficient and ultra-fast memory and oscillator"

 

Antiferromagnetic materials have ordered spin moments that alternate between individual atomic sites, which gives them a vanishing macroscopic magnetic signature and picosecond intrinsic timescale. These properties combined with emerging spintronic phenomena make antiferromagnets suitable for future technologies such as high-density nonvolatile memory and terahertz nano-oscillator. 

 

Chromium oxide is an archetypal room-temperature antiferromagnetic insulator. Its domain state can be controlled by electric field in the presence of a small magnetic field from linear magnetoelectric effect, and can be detected by measuring the anomalous Hall signal produced by stray moments on the surface. A steady-state spin precession can be excited from an in-plane electric current in a bilayer geometry consisting of a metal with strong spin-orbit coupling and chromium oxide, and can be detected from spin pumping. We will explore the phenomenology of spin dynamics to understand the prospects of chromium oxide to act as a memory and an oscillator, and signify the present challenges.

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