Ultrafast probe of magnetization dynamics in multiferroic CoCr2 O4 and Co0.975Ge0.025Cr2 O4

Parchenko S, Ortiz Hernández N, Savoini M, Porer M, Decker M, Burganov B, Bothschafter EM, Dornes C, Windsor YW, Ramakrishnan M, Rettig L, Buzzi M, Schick D, Holldack K, Pontius N, Schüßler-Langeheine C, Radovic M, Heuver JA, Noheda B, Johnson SL & Staub U
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Parchenko, S., Ortiz Hernández, N., Savoini, M., Porer, M., Decker, M., Burganov, B., … Staub, U. (2022). Ultrafast probe of magnetization dynamics in multiferroic CoCr2 O4 and Co0.975Ge0.025Cr2 O4. Physical Review B, 105(6), 064432 (8 pp.). https://doi.org/10.1103/PhysRevB.105.064432
https://www.dora.lib4ri.ch/psi/islandora/object/psi:41272

We report on element-resolved ultrafast magnetization dynamics in multiferroic CoCr2O4 and Co0.975Ge0.025Cr2O4 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.

Details
Publication Type

Journal Article

Title

Ultrafast probe of magnetization dynamics in multiferroic CoCr2 O4 and Co0.975Ge0.025Cr2 O4

Author(s)

Parchenko, S. (6313 Microscopy and Magnetism)

Ortiz Hernández, N. (6313 Microscopy and Magnetism)

Savoini, M.

Porer, M. (6313 Microscopy and Magnetism)

Decker, M. (6313 Microscopy and Magnetism)

Burganov, B.

Bothschafter, E.M. (6313 Microscopy and Magnetism)

Dornes, C.

Windsor, Y.W. (6313 Microscopy and Magnetism)

Ramakrishnan, M. (6313 Microscopy and Magnetism)

Rettig, L. (6313 Microscopy and Magnetism)

Buzzi, M. (6313 Microscopy and Magnetism)

Schick, D.

Holldack, K.

Pontius, N.

Schüßler-Langeheine, C.

Radovic, M. (6516 Spectroscopy of Quantum Materials)

Heuver, J.A.

Noheda, B.

Johnson, S.L. (6612 Pump Laser)

Staub, U. (6313 Microscopy and Magnetism)

Journal

Physical Review B

Volume

105

Issue

6

Start Page

064432 (8 pp.)

Publication Year

2022

Peer Review

Yes

Facility

SLS
non-PSI large scale facility (e.g. ESRF, ILL, etc.)

Beamline

SIM

Funding (EC, SNSF)

European Commission: PSI-FELLOW - International Fellowship Program on Materials & Matter, Energy & Environment, Human Health & Life-Sciences, and Accelerator Technology (290605)

Swiss National Science Foundation: NCCR MUST: Molecular Ultrafast Science and Technology (phase III) (183615)

Swiss National Science Foundation: Toroidal moments and magnetic monopoles as complementary condensed-matter states (147606)

Swiss National Science Foundation: Magnetic and electric ordering and dynamics studied by soft x-rays (169017)

Swiss National Science Foundation: Magnetic and electric properties of the multiferroic orthorhombic RMnO3 family (159220)

Swiss National Science Foundation: The United Control over Charge Density and Spin State of Low Dimensional Electron System at Titanates (182695)

Swiss National Science Foundation: NCCR MARVEL: Materials’ Revolution: Computational Design and Discovery of Novel Materials (phase I) (141828)

European Commission: CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872)

Collection

PSI Publications
Open Access

Additional Information

#green; This work received funding from the DFG within the Emmy Noether program under Grant No. RE 3977/1, and within the Transregio TRR 227 Ultrafast Spin Dynamics (Projects A09 and A03)