Ultrafast optical tuning of ferromagnetism via the carrier density.

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 Eu(1-x)Gd(x)O, 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Matsubara M,Schroer A,Schmehl A,Melville A,Becher C,Trujillo-Martinez M,Schlom DG,Mannhart J,Kroha J,Fiebig M

doi

10.1038/ncomms7724

subject

Has Abstract

pub_date

2015-04-02 00:00:00

pages

6724

issn

2041-1723

pii

ncomms7724

journal_volume

6

pub_type

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