Ultrafast optical tuning of ferromagnetism via the carrier density

Masakazu Matsubara, Alexander Schroer, Andreas Schmehl, Alexander Melville, Carsten Becher, Mauricio Trujillo-Martinez, Darrell G. Schlom, Jochen Mannhart, Johann Kroha, Manfred Fiebig

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Interest in manipulating the magnetic order by ultrashort laser pulses has thrived since it was observed that such pulses can be used to alter the magnetization on a sub-picosecond timescale. Usually this involves demagnetization by laser heating or, in rare cases, a transient increase of magnetization. Here we demonstrate a mechanism that allows the magnetic order of a material to be enhanced or attenuated at will. This is possible in systems simultaneously possessing a low, tunable density of conduction band carriers and a high density of magnetic moments. In such systems, the thermalization time can be set such that adiabatic processes dominate the photoinduced change of the magnetic order - the three-temperature model for interacting thermalized electron, spin and lattice reservoirs is bypassed. In ferromagnetic Eu1-xGdxO, we thereby demonstrate the strengthening as well as the weakening of the magnetic order by ∼10% and within ≤3 ps by optically controlling the magnetic exchange interaction.

Original languageEnglish
Article number6724
JournalNature communications
Volume6
DOIs
Publication statusPublished - 2015 Apr 2

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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