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18 April 2024

» arxiv » 2004.5460

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Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs
Tomas Janda ; Joao Godinho ; Tomas Ostatnicky ; Emanuel Pfitzner ; Georg Ulrich ; Arne Hoehl ; Sonka Reimers ; Zbynek Soban ; Thomas Metzger ; Helena Reichlova ; Vít Novák ; Richard Campion ; Joachim Heberle ; Peter Wadley ; Kevin Edmonds ; Ollie Amin ; Jas Chauhan ; Sarnjeet Dhesi ; Francesco Maccherozzi ; Ruben Otxoa ; Pierre Roy ; Kamil Olejnik ; Petr Němec ; Tomas Jungwirth ; Bernd Kaestner ; Jörg Wunderlich ;
Date:	11 Apr 2020
Abstract:	Antiferromagnets offer spintronic device characteristics unparalleled in ferromagnets owing to their lack of stray fields, THz spin dynamics, and rich materials landscape. Microscopic imaging of aniferromagnetic domains is one of the key prerequisites for understading physical principles of the device operation. However, adapting common magnetometry techniques to the dipolar-field-free antiferromagnets has been a major challenge. Here we demonstrate in a collinear antiferromagnet a thermoelectric detection method by combining the magneto-Seebeck effect with local heat gradients generated by scanning far-field or near-field techniques. In a 20 nm epilayer of uniaxial CuMnAs we observe reversible 180 deg switching of the N’eel vector via domain wall displacement, controlled by the polarity of the current pulses. We also image polarity-dependent 90 deg switching of the N’eel vector in a thicker biaxial film, and domain shattering induced at higher pulse amplitudes. The antiferromagnetic domain maps obtained by our laboratory technique are compared to measurements by the established synchrotron microscopy using X-ray magnetic linear dichroism.
Source:	arXiv, 2004.5460
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