Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Microwave Field Induced Changes in Raman Modes and Magnetic Force Images of Antiferromagnetic NiO Films

Diego Caso
,
Aida Serrano
ORCID logo ,
Miriam Jaafar
,
Pilar Prieto
,
Akashdeep Kamra
,
César González-Ruano
,
Farkhad G. Aliev
*
Version 1 : Received: 2 October 2023 / Approved: 3 October 2023 / Online: 3 October 2023 (10:15:44 CEST)

A peer-reviewed article of this Preprint also exists.

Caso, D.; Serrano, A.; Jaafar, M.; Prieto, P.; Kamra, A.; González-Ruano, C.; Aliev, F.G. Microwave Field-Induced Changes in Raman Modes and Magnetic Force Images of Antiferromagnetic NiO Films. Condens. Matter 2024, 9, 7. Caso, D.; Serrano, A.; Jaafar, M.; Prieto, P.; Kamra, A.; González-Ruano, C.; Aliev, F.G. Microwave Field-Induced Changes in Raman Modes and Magnetic Force Images of Antiferromagnetic NiO Films. Condens. Matter 2024, 9, 7.

Abstract

Effective control of domain walls or magnetic textures in antiferromagnets promises to enable robust, fast, and non-volatile memories. The lack of net magnetic moment in antiferromagnets implies the need for creative ways to achieve such a manipulation. Here, we investigate changes in magnetic force microscopy (MFM) imaging and in magnon-related mode in Raman spectroscopy of virgin NiO films under a microwave pump. After the MFM and Raman studies, a combined action of broadband microwave (0.01-20 GHz, power scanned from −20 to 5 dBm) and magnetic field (up to 3 kOe) were applied to virgin epitaxial (111) NiO and (100) NiO films grown on (0001) Al2O3 and (100) MgO substrates, following which the MFM and Raman studies were repeated. We observed a suppression of the magnon-related Raman mode subsequent to the microwave exposure. Based on MFM imaging, this effect appears to be caused by the suppression of large antiferromagnetic domain walls due to the possible excitation of antiferromagnetic spin oscillations localized within the antiferromagnetic domain walls.

Keywords

NiO; domain walls; microwave; antiferromagnet; Raman

Subject

Physical Sciences, Condensed Matter Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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