Three-dimensional magnetization evolution and the role of anisotropies in thin Fe/MgO films: Static and dynamic measurements

We have quantitatively characterized the real-space components of the magnetization vector M in thin epitaxial Fe(001)/MgO(001) films through an experimental set-up based on the magneto-optical Kerr effect. The capabilities of the method permit to investigate the magnetization reversal under the effect of an applied field directly on the real-space trajectories of M, providing a straightforward interpretation of the magnetization switching mechanisms in terms of magnetic anisotropies and domains formation. Using the pump-probe technique we also studied the three-dimensional precession dynamics of the magnetization vector triggered by a femtosecond laser pulse, revealing how the anisotropy fields (magnetocrystalline and shape) affect the observed features of the precessional dynamics, i.e., the frequency and the amplitude of motion. Our quantitative approach permits a deeper understanding of the basic mechanisms underlying spin dynamics and it can be successfully applied to a large class of magnetic thin layers

Femtosecond laser spectroscopy of spins: Magnetization dynamics in thin magnetic films with spatio-temporal resolution

Femtosecond laser spectroscopy of spins: Magnetization dynamics in thin magnetic films with spatio-temporal resolutio

Ultrafast three-dimensional magnetization precession and magnetic anisotropy of a photoexcited thin film of iron

We investigated the three-dimensional dynamics of the magnetization vector launched by an intense infrared pulse of femtosecond duration in a thin Fe film. We demonstrate how a single experiment of time-resolved magneto-optical Kerr effect can provide quantitative information on the temporal evolution of the magnetization trajectory. Our approach allows us to follow the precessional motion of the magnetization and to retrieve the modulus and orientation of the magnetocrystalline anisotropy field as a function of time—and therefore of the local temperature—providing a direct experimental evidence of the phenomenological mechanism triggering the magnetization precession

Time Gated Optical Projection Tomography for 3-D Imaging of Highly Scattering Biological Models

Time Gated Optical Projection Tomography for 3-D Imaging of Highly Scattering Biological Model

Time-gated optical projection tomography

We present an imaging technique that combines optical projection tomography with ballistic imaging using ultrafast time gating. The method provides high-resolution reconstruction of scattering samples and is suitable for three-dimensional (3D) imaging of biological models

High Order Harmonic Driven by a Self-Phase-Stabilized IR Parmetric Source

High Order Harmonic Driven by a Self-Phase-Stabilized IR Parmetric Sourc

Single-Mode Tunable Organic Laser Based on an Electroluminescent Oligothiophene

Single-mode tunable laser emission is obtained from a stable cavity based on a prototype compound of a class of functionalized electroluminescent oligothiophenes. Laser emission is demonstrated in the red spectral region with a tunability wavelength range of 30 nm, centered at 607 nm. The laser exhibits a well-defined pump threshold and good emission characteristics. The results suggest the use of the family of functionalized oligothiophenes as optical amplifiers covering the whole visible spectral region

Interplay between GDD-Induced Polarization Gating and Ionization for Isolated Attosecond Pulse Generation from Multi-Cycle Driving Pulses

Interplay between GDD-Induced Polarization Gating and Ionization for Isolated Attosecond Pulse Generation from Multi-Cycle Driving Pulse

Gating of high-order harmonics generated by incommensurate two-color mid-IR laser pulses

Gating of high-order harmonics generated by incommensurate two-color mid-IR laser pulse