Ballistic Hall micromagnetometry: from III-V to 2D

21/04/2020 @ 4:00 PM – 5:00 PM Asia/Singapore Timezone

CA2DM Homely Atmosphere Online Seminars (CHAOS)

Speaker: Professor Konstantin Novoselov
Affiliation: NUS – Department of Material Science and Engineering
Abstract Details:
Ballistic Hall micromagnetometry is a technique to measure magnetisation of the mesoscopic objects. Since it was introduced in mid-90s, it was successfully used to study collective vortex formation and penetration in mesoscopic superconductors, magnetisation states of microscopic ferromagnets, ferromagnetic domain wall propagation on atomic scale and many other phenomena. Still, the range of applications of this technique was rather limited due to the properties of the two-dimensional electron gas in III-V GaAs/AlGaAs heterostructures used. The advent of graphene, where ballistic transport extends practically to room temperatures, allowed us to revisit this technique and consider its application to study a much broader range of phenomena. Furthermore, as recently 2D ferromagnets became the centre of attention, the van der Waals heterostructures, formed between graphene and 2D ferromagnets, present an ideal system to study magnetic properties of such materials. In my talk I will review the opportunities presented by Ballistic Hall micromagnetometry and will focus on the recent advances in terms of it applications to study 2D ferromagnets.

About the Speaker:
Konstantin Sergeevich Novoselov FRS (Tan Chin Tuan Centennial Professor)

Prof Sir Konstantin ‘Kostya’ Novoselov FRS was born in Russia in August 1974. He has both British and Russian citizenship. He is best known for isolating graphene in 2004, and is an expert in condensed matter physics, mesoscopic physics and nanotechnology. Every year since 2014 Kostya Novoselov is included in the list of the most highly cited researchers in the world. He was awarded the Nobel Prize for Physics in 2010 for his achievements with graphene

He graduated from the Moscow Institute of Physics and Technology, and undertook his PhD studies at the University of Nijmegen in the Netherlands before moving to The University of Manchester in 2001 and then to the National University of Singapore in 2019. Professor Novoselov has published more than 350 peer-reviewed research papers. He was awarded with numerous prizes, including Nicholas Kurti Prize (2007), International Union of Pure and Applied Science Prize (2008), MIT Technology Review young innovator (2008), Europhysics Prize (2008), Bragg Lecture Prize from the Union of Crystallography (2011), the Kohn Award Lecture (2012), Leverhulme Medal from the Royal Society (2013), Onsager medal (2014), Carbon medal (2016), Dalton medal (2016), Otto Warburg Prize (2019) among many others. He was knighted in the 2012 New Year Honours.

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