Soiree

Piezomagnetic Manganese Nitrides for Thin Film Caloric and Spintronic applications

Assistant Professor Jan Zemen

Czech Technical University, Prague

Professor Lesley Cohen

Imperial College London

Thursday 21st February 2019
Time: 4pm
Venue: Sutton lecture theatre room 131, Royal School of Mines, Imperial College london
Contact: Ms hafiza Bibi
Tel: 020 7594 7252

Piezomagnetic Manganese Nitrides for Thin Film Caloric and Spintronic applications

Lesley Cohen and Jan Zemen

This is a story about the marriage between theory and experiment, in particular about our joint exploration of non-collinear antiferromagnetic manganese nitrides. Antiferromagnets hold interest because of their potential for application in spintronic devices, as an active layer that offers fast switching and a robust insensitivity to magnetic field [1,2] In addition, controlling magnetism with electric field directly or through strain-driven piezoelectric coupling remains a key goal of spintronics [3]. Our studies focus on the Mn3AN system, where Zemen and collaborators (including Karl Sandeman previously of Imperial College) predicted giant piezomagnetism (a linear magneto-mechanic coupling effect) [4,5] and the existence of a rich magnetic-strain phase diagram which may hold interest for thin film calorics [6]. In this talk we will set the scene and review our joint efforts along with colleagues in the Materials department, to demonstrate experimentally that giant piezomagnetism, is manifest in antiperovskite Mn3NiN [7], and further to this our study of the intrinsic anomalous Hall effect and exploration of the rich  temperature-strain related magnetic phase diagram.

Schematic from [7]

 

[1] T. Jungwirth et al., ‘Antiferromagnetic spintronics’ Nat. Nanotech 11, 231 (2016)

[2] V. Baltz et al., ‘Antiferromagnetic spintronics’ Rev. Mod. Phys. 90, 015005 (2018)

[3] Han Yan et al., ‘A piezoelectric, strain-controlled antiferromagnetic memory insenstive to magnetic fields’ Nat. Nanotech 7 Jan on line publication (2019)

[4]P Lukashev et al., Theory of the Piezomagnetic Effect in Mn-Based Antiperovskites. Phys. Rev. B:

Condens. Matter Mater. Phys. 78, 184414 (2008).

[5] J. Zemen et al., Piezomagnetism as a counterpart of the magnetovolume effect in magnetically frustrated

Mn-based antiperovskite nitrides. Phys. Rev. B 96, 024451 (2017).

[6] J. Zemen et al.,Frustrated Magnetism and Caloric Effects in Mn-Based Antiperovskite Nitrides: Ab Initio Theory. Phys. Rev. B .95, 184438 (2017).

[7] D. Boldin et al., Giant Piezomagnetism in Mn3NiN, ACS Appl. Mater. Interfaces 10, 18863−18868 (2018).

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