Hybrid Magnon-Phonon Localization Enhances Function near Ferroic Glassy States

Published

June 14, 2024

Author(s)

Michael Manley, Paul Stonaha, Nickolaus Bruno, Ibrahim Karaman, Raymundo Arroyave, Songxue Chi, Douglas Abernathy, Matthew Stone, Yuri Chumlyakov, Jeffrey Lynn

Abstract

Ferroic materials on the verge of forming ferroic glasses exhibit heightened functionality that is often attributed to competing long- and short-range correlations. However, the physics underlying these enhancements is not well understood. The Ni45Co5Mn36.6In13.4 Heusler alloy is on the edge of forming both spin and strain glasses and exhibits magnetic field–induced shape memory and large magnetocaloric effects, making it a candidate for multicaloric cooling applications. We show using neutron scattering that localized magnon-phonon hybrid modes, which are inherently spread across reciprocal space, act as a bridge between phonons and magnons and result in substantial magnetic field–induced shifts in the phonons, triple the caloric response, and alter phase stability. We attribute these modes to the localization of phonons and magnons by antiphase boundaries coupled to magnetic domains. Because the interplay between short- and long-range correlations is common near ferroic glassy states, our work provides general insights on how glassiness enhances function.

Citation

Science Advances

Volume

10

Issue

24

Pub Type

Journals

Download Paper

https://doi.org/10.1126/sciadv.adn2840

Local Download

Keywords

Shape memory alloys, Heusler, neutron scattering, phonon dynamics, spin waves, hybrid excitations, multyicaloric material, antiphase boundaries

Citation

Manley, M. , Stonaha, P. , Bruno, N. , Karaman, I. , Arroyave, R. , Chi, S. , Abernathy, D. , Stone, M. , Chumlyakov, Y. and Lynn, J. (2024), Hybrid Magnon-Phonon Localization Enhances Function near Ferroic Glassy States, Science Advances, [online], https://doi.org/10.1126/sciadv.adn2840, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956542 (Accessed November 23, 2024)