Visual Interaction Platform

The Visual Interaction Platform (VIP) is a Natural User Interface (NUI) that builds on human skills of real world object manipulation and allows unhindered human-human communication in a collaborative situation. The existing VIP is being extended towards the VIP-3 in order to allow support for new kinds of interactions. An example of a natural augmented reality interface to be realized on the VIP-3 is a pen-and-paper interface that combines properties of real pen-and-paper with typical computer functionality for flexible re-use of information. Two ongoing research projects on the VIP-3 are also briefly discussed: the first project develops supporting tools for early architectural design, while the second project aims at supporting 3D interaction for navigating and browsing through multidimensional data sets

Nonreciprocal spin wave spectroscopy of thin Ni–Fe stripes

The authors report on the observation of nonreciprocal spin wave propagation in a thin ( ? 200?nm) patterned Ni–Fe stripe. The spin wave transmission spectrum is measured using a pair of microstrip lines as antennas. The nonreciprocity of surface wave dispersion brought about by an adjacent aluminum ground leads to a nonreciprocal coupling of the antennas. The effects of Ni–Fe film conductivity, thickness, and reflections caused by the lateral confinement of the magnetic stripe are discussed. The nonreciprocity observed in this structure can potentially be used to realize nonreciprocal microwave devices on silicon.Microelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc

Impedance of a planar solenoid with a thin magnetic core

The high-frequency impedance of a planar solenoid with a thin magnetic core is theoretically investigated using the magnetostatic Green’s function formalism. It is shown that the electrical behavior of the solenoid depends on how the magnetic field induced by the current-carrying coil is coupled to the different magnetostatic modes of the core. The magnetic response of the core in each mode is determined by an effective susceptibility matrix which depends on exact, but mode-dependent demagnetization factors. Those factors determine the frequency of the magnetostatic excitations of the core, manifested as resonances in the impedance of the solenoid. Using the formalism developed, the effect of the core width and magnetic loss on the impedance of the device is studied.Electrical Engineering, Mathematics and Computer Scienc

Nonreciprocal spin waves in Co-Ta-Zr films and multilayers

The propagation of spin waves in single and multilayered ferromagnetic Co-Ta-Zr films is experimentally investigated in this work. Two microstrip antennas placed on top of the magnetic core are used for signal transmission and reception. A metallic ground layer placed on one side of the magnetic film leads to nonreciprocal spin wave dispersion, resulting in a direction-dependent coupling of the antennas. Compared to previous experiments with Ni-Fe films, the higher resistivity of the Co-Ta-Zr reduces the energy dissipation in the device and allows for the incorporation of a thicker magnetic film, thereby increasing the nonreciprocity and the spin wave propagation frequency range. In the case of the Co-Ta-Zr/SiO2 multilayer, the spin wave-mediated coupling of the antennas is strongly dependent on the relative orientation of the magnetizations in the individual layers, and on the application of an external magnetic field. © 2009 IEEE

Nonreciprocal spin waves in Co-Ta-Zr films and multilayers

The propagation of spin waves in single and multilayered ferromagnetic Co-Ta-Zr films is experimentally investigated in this work. Two microstrip antennas placed on top of the magnetic core are used for signal transmission and reception. A metallic ground layer placed on one side of the magnetic film leads to nonreciprocal spin wave dispersion, resulting in a direction-dependent coupling of the antennas. Compared to previous experiments with Ni-Fe films, the higher resistivity of the Co-Ta-Zr reduces the energy dissipation in the device and allows for the incorporation of a thicker magnetic film, thereby increasing the nonreciprocity and the spin wave propagation frequency range. In the case of the Co-Ta-Zr/SiO2 multilayer, the spin wave-mediated coupling of the antennas is strongly dependent on the relative orientation of the magnetizations in the individual layers, and on the application of an external magnetic field. © 2009 IEEE

The effect of a neighboring metal layer on the high-frequency characteristics of a thin magnetic stripe

The spin-wave spectrum of a ferromagnetic stripe placed above a metallic layer with finite conductivity is studied by using the magnetostatic Green’s function formalism. It is shown that the frequency and linewidth of the resonances are uniquely determined by complex, mode-dependent demagnetization factors. The formalism developed is used to analyze the resonance characteristics of the magnetic stripe as a function of its width and separation from the metallic layer.Delft Institute of Microelectronics and Submicron TechnologyElectrical Engineering, Mathematics and Computer Scienc

Integrated microstrip lines with Co-Ta-Zr magnetic films

Microstrip transmission lines with ferromagnetic Co-Ta-Zr cores are investigated in this paper. Compared to nonmagnetic devices, an increase in both inductance (×11) and quality factor (× 6) is achieved in the transmission lines. The role of the magnetic material\u27s electrical resistivity and the effect of the shape-induced anisotropy field (created by patterning the magnetic film into narrow stripes) are discussed. It is shown that the nonuniform distribution of the shape anisotropy inside the Co-Ta-Zr pattern can be used to advantage by proper placement of the signal line, thereby increasing the ferromagnetic resonance (FMR) frequency of the magnetic core. Inductance enhancement is achieved at frequencies up to ∼10 GHz. © 2008 IEEE

Integrated microstrip lines with Co-Ta-Zr magnetic films

Microstrip transmission lines with ferromagnetic Co-Ta-Zr cores are investigated in this paper. Compared to nonmagnetic devices, an increase in both inductance (×11) and quality factor (× 6) is achieved in the transmission lines. The role of the magnetic material\u27s electrical resistivity and the effect of the shape-induced anisotropy field (created by patterning the magnetic film into narrow stripes) are discussed. It is shown that the nonuniform distribution of the shape anisotropy inside the Co-Ta-Zr pattern can be used to advantage by proper placement of the signal line, thereby increasing the ferromagnetic resonance (FMR) frequency of the magnetic core. Inductance enhancement is achieved at frequencies up to ∼10 GHz. © 2008 IEEE