2 research outputs found
A sample holder with integrated laser optics for an ELMITEC photoemission electron microscope
A local view of the laser induced magnetic domain dynamics in CoPd stripe domains at the picosecond time scale
The dynamic of the magnetic structure in a well ordered ferromagnetic CoPd
stripe domain pattern has been investigated upon excitation by femtosecond
infrared laser pulses. Time-resolved X-ray magnetic circular dichroism in
photoemission electron microscopy (TR-XMCD-PEEM) is used to perform real space
magnetic imaging with 100 ps time resolution in order to show local
transformations of the domains structures. Using the time resolution of the
synchrotron radiation facility of the Helmholtz-Zentrum Berlin, we are able to
image the transient magnetic domains in a repetitive pump and probe experiment.
In this work, we study the reversible and irreversible transformations of the
excited magnetic stripe domains as function of the laser fluence. Our results
can be explained by thermal contributions, reducing the XMCD amplitude in each
stripe domain below a threshold fluence of 12 mJ/cm2. Above this threshold
fluence, irreversible transformations of the magnetic domains are observed.
Static XMCD-PEEM images reveal the new partially ordered stripe domain
structures characterized by a new local magnetic domain distribution showing an
organized pattern at the micrometer scale. This new arrangement is attributed
to the recovery of the magnetic anisotropy during heat dissipation under an
Oersted field.Comment: 20 pages including 8 figures and 1 Tabl