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

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; U. Staub

doi:10.1103/PhysRevB.105.064432

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

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. JohnsonU. Staub^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

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.

Original language	English
Article number	064432
Number of pages	8
Journal	Physical Review B
Volume	105
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.105.064432
Publication status	Published - 1-Feb-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 4Final publisher's version, 1.24 MBLicence: Taverne

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Parchenko, S., Ortiz Hernández, N., Savoini, M., Porer, M., Decker, M., Burganov, B., Bothschafter, E. M., Dornes, C., Windsor, Y. W., Ramakrishnan, M., Rettig, L., Buzzi, M., Schick, D., Holldack, K., Pontius, N., Schüßler-Langeheine, C., Radovic, M., Heuver, J. A., Noheda, B., ... Staub, U. (2022). Ultrafast probe of magnetization dynamics in multiferroic CoCr2 O4 and Co0.975Ge0.025Cr2 O4. Physical Review B, 105(6), Article 064432. https://doi.org/10.1103/PhysRevB.105.064432

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

abstract = "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.",

author = "S. Parchenko and {Ortiz Hern{\'a}ndez}, N. and M. Savoini and M. Porer and M. Decker and B. Burganov and Bothschafter, {E. M.} and C. Dornes and Windsor, {Y. W.} and M. Ramakrishnan and L. Rettig and M. Buzzi and D. Schick and K. Holldack and N. Pontius and C. Sch{\"u}{\ss}ler-Langeheine and M. Radovic and Heuver, {J. A.} and B. Noheda and Johnson, {S. L.} and U. Staub",

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day = "1",

doi = "10.1103/PhysRevB.105.064432",

language = "English",

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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 2022, 'Ultrafast probe of magnetization dynamics in multiferroic CoCr2 O4 and Co0.975Ge0.025Cr2 O4', Physical Review B, vol. 105, no. 6, 064432. https://doi.org/10.1103/PhysRevB.105.064432

TY - JOUR

T1 - Ultrafast probe of magnetization dynamics in multiferroic CoCr2 O4 and Co0.975Ge0.025Cr2 O4

AU - Parchenko, S.

AU - Ortiz Hernández, N.

AU - Savoini, M.

AU - Porer, M.

AU - Decker, M.

AU - Burganov, B.

AU - Bothschafter, E. M.

AU - Dornes, C.

AU - Windsor, Y. W.

AU - Ramakrishnan, M.

AU - Rettig, L.

AU - Buzzi, M.

AU - Schick, D.

AU - Holldack, K.

AU - Pontius, N.

AU - Schüßler-Langeheine, C.

AU - Radovic, M.

AU - Heuver, J. A.

AU - Noheda, B.

AU - Johnson, S. L.

AU - Staub, U.

PY - 2022/2/1

Y1 - 2022/2/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85126061101&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.105.064432

DO - 10.1103/PhysRevB.105.064432

M3 - Article

SN - 2469-9950

VL - 105

JO - Physical Review B

JF - Physical Review B

IS - 6

M1 - 064432

ER -

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

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