Ultrafast probe of magnetization dynamics in multiferroic ${\mathrm{CoCr}}_{2}{\mathrm{O}}_{4}$ and ${\mathrm{Co}}_{0.975}{\mathrm{Ge}}_{0.025}{\mathrm{Cr}}_{2}{\mathrm{O}}_{4}$

Ultrafast probe of magnetization dynamics in multiferroic ${CoCr}_{2} O_{4}$ and ${Co}_{0.975} {Ge}_{0.025} {Cr}_{2} O_{4}$

S. Parchenko, N. Ortiz Hernández, M. Savoini, M. Porer, M. Decker, B. Burganov, E. M. Bothschafter, C. Dornes, Y. W. Windsor, M. Ramakrishnan, L. Rettig, M. Buzzi, D. Schick, K. Holldack, N. Pontius, C. Schüßler-Langeheine, M. Radovic, J. A. Heuver, B. Noheda, S. L. Johnson, and U. Staub

Phys. Rev. B 105, 064432 – Published 25 February 2022

Abstract

We report on element-resolved ultrafast magnetization dynamics in multiferroic ${CoCr}_{2} O_{4}$ and ${Co}_{0.975} {Ge}_{0.025} {Cr}_{2} O_{4}$ after optical excitation above the electronic band gap. We observe demagnetization dynamics in the range of several picoseconds, up to two orders of magnitude faster than previously reported demagnetization in other ferrimagnetic insulators. Moreover, we find that the dynamics of the two magnetic ions differ significantly just below the Curie point. The dynamics of the low-temperature multiferroic phase are almost two times slower than those in the ferrimagnetic phase. This suggests that the additional magnetic cycloidal component, which is coupled to electric polarization at low temperatures, might influence the ultrafast magnetization dynamics.

Received 1 April 2021
Revised 1 December 2021
Accepted 28 January 2022

DOI:https://doi.org/10.1103/PhysRevB.105.064432

Physics Subject Headings (PhySH)

Ultrafast magnetization dynamics

Multiferroics Strongly correlated systems

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Parchenko^1,2,3,*, N. Ortiz Hernández¹, M. Savoini⁴, M. Porer¹, M. Decker¹, B. Burganov⁴, E. M. Bothschafter¹, C. Dornes⁴, Y. W. Windsor^1,5, M. Ramakrishnan ¹, L. Rettig^1,5, M. Buzzi ¹, D. Schick⁶, K. Holldack⁶, N. Pontius⁶, C. Schüßler-Langeheine⁶, M. Radovic ¹, J. A. Heuver⁷, B. Noheda⁷, S. L. Johnson^3,8, and U. Staub^1,†

¹Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland
²Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
³Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
⁴Institute for Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, Wolfgang-Pauli-Str. 16, 8093 Zürich, Switzerland
⁵Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14915 Berlin, Germany
⁶Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
⁷Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, The Netherlands
⁸SwissFEL, Paul Scherrer Institut, 5232 Villigen, Switzerland

^*Present address: European X-Ray Free-Electron Laser, Holzkoppel 4, 22869 Schenefeld, Germany; Corresponding author: sergii.parchenko@xfel.eu
^†Corresponding author: urs.staub@psi.ch

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Vol. 105, Iss. 6 — 1 February 2022

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Physical Review B

covering condensed matter and materials physics

Ultrafast probe of magnetization dynamics in multiferroic ${CoCr}_{2} O_{4}$ and ${Co}_{0.975} {Ge}_{0.025} {Cr}_{2} O_{4}$

S. Parchenko, N. Ortiz Hernández, M. Savoini, M. Porer, M. Decker, B. Burganov, E. M. Bothschafter, C. Dornes, Y. W. Windsor, M. Ramakrishnan, L. Rettig, M. Buzzi, D. Schick, K. Holldack, N. Pontius, C. Schüßler-Langeheine, M. Radovic, J. A. Heuver, B. Noheda, S. L. Johnson, and U. Staub

Phys. Rev. B 105, 064432 – Published 25 February 2022

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Physical Review B

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Ultrafast probe of magnetization dynamics in multiferroic CoCr2O4 and Co0.975Ge0.025Cr2O4

S. Parchenko, N. Ortiz Hernández, M. Savoini, M. Porer, M. Decker, B. Burganov, E. M. Bothschafter, C. Dornes, Y. W. Windsor, M. Ramakrishnan, L. Rettig, M. Buzzi, D. Schick, K. Holldack, N. Pontius, C. Schüßler-Langeheine, M. Radovic, J. A. Heuver, B. Noheda, S. L. Johnson, and U. Staub

Phys. Rev. B 105, 064432 – Published 25 February 2022

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Ultrafast probe of magnetization dynamics in multiferroic ${CoCr}_{2} O_{4}$ and ${Co}_{0.975} {Ge}_{0.025} {Cr}_{2} O_{4}$