Probing spin waves in Co3O4 nanoparticles for magnonics applications

Mikhail Feygenson; Zhongyuan Huang; Yinguo Xiao; Xiaowei Teng; Wiebke Lohstroh; Nileena Nandakumaran; Jörg C. Neuefeind; Michelle Everett; Andrey A. Podlesnyak; Germán Salazar-Alvarez; Seda Ulusoy; Mario Valvo; Yixi Su; Sascha Ehlert; Asma Qdemat; Marina Ganeva; Lihua Zhang; Meigan C. Aronson

doi:10.1039/D3NR04424F

Probing spin waves in Co₃O₄ nanoparticles for magnonics applications†

Mikhail Feygenson,

*^abc Zhongyuan Huang,‡^d Yinguo Xiao,

^d Xiaowei Teng,

^e Wiebke Lohstroh,^f Nileena Nandakumaran,^g Jörg C. Neuefeind,^h Michelle Everett,^h Andrey A. Podlesnyak,

^h Germán Salazar-Alvarez,

^c Seda Ulusoy,^c Mario Valvo,

ⁱ Yixi Su,^j Sascha Ehlert,^b Asma Qdemat,^g Marina Ganeva,

^j Lihua Zhang^k and Meigan C. Aronson^l

Author affiliations

* Corresponding authors

^a European Spallation Source ERIC, SE-221 00 Lund, Sweden
E-mail: mikhail.feygenson@ess.eu

^b Jülich Centre for Neutron Science (JCNS-1) at Forschungszentrum Jülich, D-52425 Jülich, Germany

^c Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, Sweden

^d School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, China

^e Worcester Polytechnic Institute, Department of Chemical Engineering, Worcester 01609, USA

^f Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 8574 Garching, Germany

^g Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institute (PGI-4), Jülich GmbH, Jülich, Germany

^h Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

ⁱ Department of Chemistry, Uppsala University, 75121 Uppsala, Sweden

^j Jülich Centre for Neutron Science (JCNS-4) at Heinz Maier-Leibnitz-Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching, Germany

^k Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, USA

^l Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada

Abstract

The magnetic properties of spinel nanoparticles can be controlled by synthesizing particles of a specific shape and size. The synthesized nanorods, nanodots and cubic nanoparticles have different crystal planes selectively exposed on the surface. The surface effects on the static magnetic properties are well documented, while their influence on spin waves dispersion is still being debated. Our ability to manipulate spin waves using surface and defect engineering in magnetic nanoparticles is the key to designing magnonic devices. We synthesized cubic and spherical nanoparticles of a classical antiferromagnetic material Co₃O₄ to study the shape and size effects on their static and dynamic magnetic proprieties. Using a combination of experimental methods, we probed the magnetic and crystal structures of our samples and directly measured spin wave dispersions using inelastic neutron scattering. We found a weak, but unquestionable, increase in exchange interactions for the cubic nanoparticles as compared to spherical nanoparticle and bulk powder reference samples. Interestingly, the exchange interactions in spherical nanoparticles have bulk-like properties, despite a ferromagnetic contribution from canted surface spins.

Nanoscale

Probing spin waves in Co₃O₄ nanoparticles for magnonics applications†

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Probing spin waves in Co₃O₄ nanoparticles for magnonics applications

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