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ICMAB Upcoming Events

"New artificial structures for topological spintronics" by Jak Chakhalian (Mon, 14 March 2023)

The Seminars and Training Committee kindly invites you to the following ICMAB Invited Seminar on spintronics: 

Anna May
22 February 2023

New artificial structures for topological spintronics

 

by Jak Chakhalian, Rutgers University, Piscataway, New Jersey, USA


Tuesday, 14 March 2023
12 PM
ICMAB - Sala d'Actes Carles Miravitlles and ONLINE (Register here to attend by Zoom)

Abstract:

Topological spintronics with antiferromagnets has recently emerged as a powerful tool for manipulating spin waves in magnetic systems. One of the main advantages of using antiferromagnets is that it is possible to engineer new functionalities into these systems by exploiting the spin-dependent coupling between antiferromagnetic layers. This idea has been demonstrated in several studies where topological spintronics with antiferromagnets enabled the manipulation of skyrmion and domain wall motion, spin-wave propagation, and even the creation of new devices such as logic gates. With further developments in materials fabrication methods, it is anticipated that topological spintronics with antiferromagnets will be increasingly used for new types of spintronic applications in the near future.

In addition to device technology, spintronics with antiferromagnets also holds promise for providing insight into fundamental physical phenomena. For example, antiferromagnets with large spin-orbit interaction possess unique spin textures and topological configurations, which may be manipulated using electric and optical fields. Those findings have enabled the exploration of various intriguing physical phenomena such as chiral magnons, spin-Seebeck effects, anomalous Hall conductivity, and large magnetoresistance. Such studies can further our fundamental understanding of spintronics and associated technologies, aiding in further developing these technologies for practical applications.

However, research in this area is still relatively new and limited. Nonetheless, progress is already underway. In this talk, I will discuss fresh ways to address the challenges by (1) creating new synthetic templates with rich many-body behavior derived from the class of rare-earth pyrochlore iridates and spinels, (2) discovering interesting states and phenomena entwined with spin correlations and non-trivial band topology including quantum spin liquid, Weyl semimetal, and potentially gaped Dirac and surface axionic states. Specifically, I will focus on the feasibility of experimental validation of those states within the oriented thin films of synthetic materials with entangled fermions and large spin-orbit interaction.

Bio:

2002- graduated with  PhD in Physics from UBC, Vancouver  (muon spin resonance on low dimensional  TM oxides, mostly  cuprates - adviser Rob Kiefl) 
6 months  postdoc at  TRIUMF national  research facilty, Vancouver  (beta-NMR  with polarized ions - adviser Jess Brewer)
Fall 2002-2005-  postdoc at  MPI Stuttgart (Keimer);  led projects on physics of correlated electronic interfaces and growth  and photoelectron resonant spectroscopies.
2006 - assistant  professor at the Unv. Of Arkansas at  Fayetteville .
2010 - associate  professor and chair.
2012- full professor 
2016- present Lovelace Professor of Physics at  Rutgers

2007 - received the Outstanding young  investigator early  career  award (for 5 years) from National Science Foundation
2012 - selected as Betty  and Gordon Moore foundation EPIQS fellow in the program for quantum materials synthesis.
2016 - co-Director of  Rutgers's center for Quantum Materials Synthesis (cQMS).

JC expertise is in the area of growth by  pulsed laser deposition and advanced  characterization of  ultra-thin films and heterostructrures of strongly  correlated compounds with  focus on structures  with exotic magnetism, band topology   and superconductivity.  In addition, Jak is an expert user of synchrotron based resonant photoelectron  probes.

Hosted by Josep Fontcuberta, ICMAB-CSIC

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