Electronic and magnetic structure of Fe3O4/BiFeO3 multiferroic superlattices: First principles calculations J. Appl. Phys. 112, 063925 (2012) Platinum thickness dependence of the inverse spin-Hall voltage from spin pumping in a hybrid yttrium iron garnet/platinum system Appl. Phys. Lett. 101, 132414 (2012) Pulse voltage-induced dynamic magnetization switching in magnetic tunneling junctions with high resistancearea product Appl. Phys. Lett. 101, 102406 (2012) Spin transport and spin dephasing in zinc oxide Appl. Phys. Lett. 101, 082404 (2012) Spin and valley dependent electronic transport in strain engineered graphene

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In laser machining with ultrashort laser pulses unwanted X-ray radiation in the keV range can be generated when a critical laser intensity is exceeded. Even if the emitted X-ray dose per pulse is low, high laser repetition rates can lead to an accumulation of X-ray doses beyond exposure safety limits. For 925 fs pulse duration at a center wavelength of 1030 nm, the X-ray emission was investigated up to an intensity of 2.6 × 10 14 W/cm 2 . The experiments were performed in air with a thin disk laser at a repetition rate of 400 kHz. X-ray spectra and doses were measured for various planar target materials covering a wide range of the periodic table from aluminum to tungsten. Without radiation shielding, the measured radiation doses at this high repetition rate clearly exceed the regulatory limits. Estimations for an adequate radiation shielding are provided.

We present a laser plasma based x-ray microscope for the water window employing a high-average power laser system for plasma generation. At 90 W laser power a brightness of 7.4 x 10(11) photons/(s x sr x μm(2)) was measured for the nitrogen Lyα line emission at 2.478 nm. Using a multilayer condenser mirror with 0.3 % reflectivity 10(6) photons/(μm(2) x s) were obtained in the object plane. Microscopy performed at a laser power of 60 W resolves 40 nm lines with an exposure time of 60 s. The exposure time can be further reduced to 20 s by the use of new multilayer condenser optics and operating the laser at its full power of 130 W.

X‐ray optics with high energy resolution and collection efficiency are required in X‐ray spectroscopy for investigations of chemistry and coordination. This is particularly the case if the X‐ray source emits a rather weak signal into a large solid angle. In the present work the performance of a spectrometer based on thin mosaic crystals was investigated for different spectroscopic methods using various X‐ray sources. It was found that, even with low‐power X‐ray sources, advanced high‐resolution X‐ray spectroscopy can be performed.