Hybrid magnon-phonon localization enhances function near ferroic glassy states

Michael E. Manley, Paul J. Stonaha, Nickolaus M. Bruno, Ibrahim Karaman, Raymundo Arroyave, Songxue Chi, Douglas L. Abernathy, Matthew B. Stone, Yuri I. Chumlyakov, Jeffrey W. Lynn

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1 Scopus citations

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.

Original languageEnglish
Article numbereadn2840
JournalScience Advances
Volume10
Issue number24
DOIs
StatePublished - Jun 2024

Funding

this work was supported by the US department of energy, Office of Science, Office of Basic energy Sciences, Materials Sciences and engineering division, under contract number de-Ac05-00OR22725. A portion of this research performed at the Oak Ridge national laboratory\u2019s high Flux isotope Reactor and Spallation neutron Source was sponsored by the US department of energy, Office of Basic energy Sciences. We acknowledge the support of the national institute of Standards and technology, US department of commerce, in providing the neutron research facilities used in this work. the identification of any commercial product or trade name does not imply endorsement or recommendation by the national institute of Standards and technology. i.K. and R.A. acknowledge the grant support from the US Army Research Office, grant no. W911nF2220117. Acknowledgments Funding: this work was supported by the US department of energy, Office of Science, Office of Basic energy Sciences, Materials Sciences and engineering division, under contract number de-Ac05-00OR22725. A portion of this research performed at the Oak Ridge national laboratory\u2019s high Flux isotope Reactor and Spallation neutron Source was sponsored by the US department of energy, Office of Basic energy Sciences. We acknowledge the support of the national institute of Standards and technology, US department of commerce, in providing the neutron research facilities used in this work. the identification of any commercial product or trade name does not imply endorsement or recommendation by the national institute of Standards and technology. i.K. and R.A. acknowledge the grant support from the US Army Research Office, grant no. W911nF2220117. Author contributions: M.e.M. and R.A. designed and planned this research. n.M.B., i.K., and Y.i.c. prepared the crystals. the triple-axis neutron measurements were performed by P.J.S. and M.e.M. with assistance from J.W.l. on Bt7 at niSt and S.c. on hB3 at hFiR. the time-of-flight neutron measurements were performed by P.J.S. and M.e.M. with assistance from d.l.A. on ARcS at the SnS and M.B.S. on SeQUOiA at the SnS. Manuscript was written by M.e.M. with input from all authors. Competing interests: the authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Raw triple-axis neutron scattering data collected on the Bt7 spectrometer are available at https://dx.doi.org/10.18434\\t4201B?urlappend=bt7/201610/22757/ (magnetic field dependence) and https://dx.doi.org/10.18434/t4201B?urlappend=bt7/201511/20885/ (temperature dependence). Raw triple-axis neutron scattering data collected on the hB3 spectrometer are available at https://doi.org/10.14461/oncat.data/2337704 (temperature dependence). the data collected on the ARcS spectrometer are available at https://doi. org/10.14461/oncat.data/2333624 (MSMA) and https://doi.org/10.14461/oncat.data/2333625 (StG state). the data collected on the SeQUOiA spectrometer are located at https://doi. org/10.14461/oncat.data/2335305 (StG state).

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