We present the results of magnetic force microscopy investigations of domain structures in multilayer [Co (0.5 nm)/Pt (1 nm)]₅ thin film structures (denoted hereafter as Co/Pt) modified by additional Co capping layers and by ion irradiation. It is demonstrated that a Co capping layer essentially changes the domain structure and decreases the threshold of magnetization reversal, due to the forma...

We have experimentally studied micrometer-scale domain wall (DW) motion driven by a magnetic field and an electric current in a Co/Pt multilayer strip with perpendicular magnetic anisotropy. The thermal activation energy for DW motion, along with its scaling with the driving field and current, has been extracted directly from the temperature dependence of the DW velocity. The injection of DC cu...

We have developed a nanofabrication technique to facilitate current-perpendicular-to-plane transport measurements on magnetic multilayer pillar structures with diameters as narrow as 100 nm—a size scale at which the reversal of individual domains within the ferromagnetic layers may be detected. When large currents are passed through such pillars, the Oersted field produced by the current can af...

A flip-chip-type MMIC architecture is used to build a wideband filter with ultrathin iron (Fe) films grown on compound semiconductor substrate (GaAs). Microwave and millimeter-wave components incorporating these ferromagnetic films possess the unique capability of having a resonance frequency that can be easily tuned by an externally applied magnetic bias. A bandstop notch filter is realized us...

The intrinsic magnetic relaxations in metallic films will be discussed. It will be shown that the intrinsic damping mechanism in metals is caused by incoherent scattering of itinerant electron-hole pair excitations by phonons and magnons. Berger @L. Berger, Phys. Rev. B 54, 9353 ~1996!# showed that the interaction between spin waves and itinerant electrons in multilayers can lead to interface G...

Using measurements of the spectra of microwave-frequency resistance oscillations, we determine the roomtemperature phase diagram of magnetic excitations caused by torques from dc spin-polarized currents in thin permalloy /copper/ thick permalloy multilayer samples. We extend the measurements to larger values of current than have been reported previously. We find several additional modes that we...

We report our experimental finding that magnetic properties of Co-based multilayer films are shown to exhibit their local variations far from the Gaussian ~or Lorentzian! distribution which are usually assumed. The local variations of the coercivity and the field dependence l(52]ln t/]H) were determined from measurements of the hysteresis loop and the field-dependent switching time t , respecti...

The phenomena of superheating and supercooling can lead to a thermal hysteresis curve where two states are stable over a range of temperatures. Here we present a simple magnetic multilayer system (Fe/Gd) that can be designed to show a thermal hysteresis curve. Calculations show that, with proper choice of parameters, the width, in temperature, of the hysteresis curve can be controlled by an ext...

An ultra-fast extreme ultra-violet (EUV) movie camera has been developed for imaging magnetic reconnection in the Caltech spheromak/astrophysical jet experiment. The camera consists of a broadband Mo:Si multilayer mirror, a fast decaying YAG:Ce scintillator, a visible light block, and a high-speed visible light CCD camera. The camera can capture EUV images as fast as 3.3 × 10(6) frames per seco...