Books

The whirring flight of hummingbirds is legendary. It propels them through the air with 50 wingbeats per second, faster than the human eye can see. [...]

Polished facets, a symmetrical cut – the object sparkling under the microscope is a real diamond. The tiny jewel has an unusual purpose – it compresses very small samples of material extremely strongly, creating a pressure like that found in Earth’s interior. [...]

In the light of upcoming gravitational wave experiments like the Laser Interferometer SpaceAntenna (LISA) we aim to improve the understanding of early universe first-order phasetransitions.In this thesis, the central subject of study is the energy budget of phase transitions. Thisthermodynamic quantity can be studied microscopically in equilibrium finite temperaturequantum field theory. [...]

The first two decades of this century mark the beginning of the precision cosmologyand astrophysics era. Two remarkable cosmological results include the measurementsof the cosmic microwave background (CMB) anisotropies by the Planck satellite andof the baryonic acoustic oscillations (BAO) by the Sloan Digital Sky Survey. [...]

The upcoming generation of hard X-ray free-electron lasers (XFEL) delivers X-raypulses with unmatched brilliance at megahertz repetition rates based on supercon-ducting linear accelerators. The European XFEL, the first XFEL of this generation,accelerates bursts of up to 2700 electron bunches every tenth of a second over adistance of 1.7 km to energies as high as 17.5 GeV. [...]

This thesis deals with the impact of ultrashort near-infrared~(nIR) and extreme ultraviolet~(XUV) laser pulses on the magnetic multi-domain states of particularly thin Co/Pt multilayers. The laser induced magnetization dynamics are investigated with femtosecond time and nanometer spatial resolution utilizing time-resolved magnetic small-angle X-ray scattering~(TR-mSAXS) at the free-electron lasers~(FEL) FLASH in Hamburg and FERMI@Elettra in Trieste.One part of the thesis deals with ultrafast demagnetization in three different Co/Pt-multilayer samples with total film thicknesses in the range of the attenuation length of nIR radiation in Co and Pt. [...]

Free-electron lasers (FELs) are the fourth generation of synchrotron light sources operating in the ultraviolet and X-ray wavelength range. The large size and the high costs of such sources limit the handiness of them. [...]

Überall, wo geforscht und entwickelt wird, passiert Innovation: Etwas Neues entsteht. Das können allumfassende Modelle für die Entstehung des Universums genauso sein wie bahnbrechende Technologien, mit deren Hilfe Atome sichtbar werden. [...]

Polierte Facetten, symmetrischer Schliff – was da unterm Mikroskop funkelt, ist ein echter Diamant. Der wertvolle Winzling dient einem außergewöhnlichen Zweck: Er presst winzigste Materialproben extrem stark zusammen und erzeugt einen Druck, wie er im Inneren der Erde herrscht. [...]