1. Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs
- Author
-
Sarnjeet S. Dhesi, Joerg Wunderlich, Francesco Maccherozzi, Georg Ulrich, O. J. Amin, Peter Wadley, Arne Hoehl, Joachim Heberle, K. W. Edmonds, Bernd Kaestner, Z. Šobáň, Petr Němec, Emanuel Pfitzner, Václav Novák, P. E. Roy, K. Olejník, T. Metzger, J.S. Chauhan, T. Janda, Sonka Reimers, Joao Godinho, R. M. Otxoa, Helena Reichlova, R. P. Campion, T. Ostatnicky, and T. Jungwirth more...
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Magnetometer ,FOS: Physical sciences ,Applied Physics (physics.app-ph) ,02 engineering and technology ,01 natural sciences ,law.invention ,Atomic force microscopy ,Condensed Matter::Materials Science ,law ,0103 physical sciences ,Thermoelectric effect ,Seebeck effect ,Antiferromagnetism ,General Materials Science ,010306 general physics ,Magneto ,Magnetic domains ,Condensed Matter - Materials Science ,Spintronics ,Condensed matter physics ,500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik ,Antiferromagnets ,Materials Science (cond-mat.mtrl-sci) ,Scanning techniques ,Physics - Applied Physics ,021001 nanoscience & nanotechnology ,AntiferromagnetismSpintronics ,Photoemission electron microscopy ,Domain wall (magnetism) ,Ferromagnetism ,Near-field optical spectroscopy ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology - 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 antiferromagnetic domains is one of the key prerequisites for understanding 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∘ switching of the Neel vector via domain wall displacement, controlled by the polarity of the current pulses. We also image polarity-dependent 90∘ switching of the Neel 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-based technique of x-ray photoemission electron microscopy using x-ray magnetic linear dichroism. more...
- Published
- 2020