TY  - JOUR
A1  - Reinhardt, Matthias
A1  - Koc, Azize
A1  - Leitenberger, Wolfram
A1  - Gaal, Peter
A1  - Bargheer, Matias
T1  - Optimized spatial overlap in optical pump-X-ray probe experiments with high repetition rate using laser-induced surface distortions
JF  - Journal of synchrotron radiation
N2  - Ultrafast X-ray diffraction experiments require careful adjustment of the spatial overlap between the optical excitation and the X-ray probe pulse. This is especially challenging at high laser repetition rates. Sample distortions caused by the large heat load on the sample and the relatively low optical energy per pulse lead to only tiny signal changes. In consequence, this results in small footprints of the optical excitation on the sample, which turns the adjustment of the overlap difficult. Here a method for reliable overlap adjustment based on reciprocal space mapping of a laser excited thin film is presented.
KW  - ultrafast X-ray diffraction
KW  - nanostructures
KW  - surface deformation
KW  - heat diffusion
KW  - optical pump
Y1  - 2016
U6  - https://doi.org/10.1107/S1600577515024443
SN  - 1600-5775
VL  - 23
SP  - 474
EP  - 479
PB  - International Union of Crystallography
CY  - Chester
ER  - 
TY  - JOUR
A1  - Iurchuk, V.
A1  - Schick, D.
A1  - Bran, J.
A1  - Colson, D.
A1  - Forget, A.
A1  - Halley, D.
A1  - Koc, Azize
A1  - Reinhardt, Mathias
A1  - Kwamen, C.
A1  - Morley, N. A.
A1  - Bargheer, Matias
A1  - Viret, M.
A1  - Gumeniuk, R.
A1  - Schmerber, G.
A1  - Doudin, B.
A1  - Kundys, B.
T1  - Optical Writing of Magnetic Properties by Remanent Photostriction
JF  - Physical review letters
N2  - We present an optically induced remanent photostriction in BiFeO3, resulting from the photovoltaic effect, which is used to modify the ferromagnetism of Ni film in a hybrid BiFeO3/Ni structure. The 75% change in coercivity in the Ni film is achieved via optical and nonvolatile control. This photoferromagnetic effect can be reversed by static or ac electric depolarization of BiFeO3. Hence, the strain dependent changes in magnetic properties are written optically, and erased electrically. Light-mediated straintronics is therefore a possible approach for low-power multistate control of magnetic elements relevant for memory and spintronic applications.
Y1  - 2016
U6  - https://doi.org/10.1103/PhysRevLett.117.107403
SN  - 0031-9007
SN  - 1079-7114
VL  - 117
PB  - American Physical Society
CY  - College Park
ER  -