A magnetoelectronic device is proposed in which a spin-current pulse produces a rapid reversal of the magnetization of a thin film nanomagnet. A spin-transfer torque induces the reversal and the switching speed is determined by the precession frequency of the magnetization in a thin film element’s demagnetization field. Micromagnetic simulations show that this switching occurs above a threshold...

There is much interest in crystallographic defects in thin film magnetic recording media and their role in influencing recording performance such as media noise and thermal loss. In this article we report a correlation between the magnetic viscosity in CoPtCr thin film media, which is the origin of thermal loss effects, and the concentration of local fcc-like regions. The concentration of these...

ion beam patterned Fe thin films: A study by selective area Stokes polarimetry and soft x-ray microscopy" (2011). A combination of analytical techniques, with special emphasis on selective area Stokes polarimetry, has been used to explore the structural properties and magnetic behavior of focused ion beam patterned Fe thin films under controlled Ga þ ion irradiation. Ion irradiation at doses ra...

Sputter deposited MgO thin films with the B1 crystal structure and ~002! film texture are used as seed layers to improve the texture and magnetic properties of the CoCrPt/Cr magnetic thin films on glass substrates for longitudinal recording. The desired ~002! textured Cr underlayers are usually obtained by sputtering Cr onto heated substrates. However, it is found that the MgO seed layers can i...

Tunneling of virtual vortex-antivortex pairs across a superconducting film can be enhanced by sending pulses of electric current along the film. Thus, a thin wire made from such a film will function as a quantum switch (changing the magnetic flux enclosed by the device). We study this process numerically in a toroidal film (periodic boundary conditions in both directions) by using the dual desc...

We theoretically show that the three-dimensional (3D) topological insulator (TI)/thin-film ferromagnetic metal (FMM) heterostructure is possible to be a quantum anomalous Hall (QAH) with wide global band gap. Studying structure and weight distributions of eigenstates, we demonstrate attachment metallic thin film on 3DTI can shift topologically nontrivial state into layers due hybridization band...

Spin wave pulse propagation in a magnetic thin film under static, spatially nonuniform magnetic fields has been studied. The experiment was carried out with an yttrium iron garnet film strip. The film strip was magnetized with a spatially nonuniform magnetic field parallel to the length of the film strip. Spin wave pulses were excited with a microstrip transducer at one end of the film strip. T...

Reflection high-energy electron diffraction (RHEED), scanning tunneling microscopy (STM), vibrating sample magnetometry, and other physical property measurements are used to investigate the structure, morphology, magnetic, and magnetotransport properties of (001)-oriented Cr2Te3 thin films grown on Al2O3(0001) and Si(111)-(7×7) surfaces by molecular beam epitaxy. Streaky RHEED patterns indicate...

The effect of lateral element size, shape, and ferromagnetic layer thickness on exchange biasing in polycrystalline IrMn/CoFe thin film elements has been studied. Magnetic hysteresis loop measurements and magnetic force microscopy imaging have been used to elucidate the basic micromagnetic behavior. Magnetic imaging of micron scale elements illustrates that the magnetization reversal modes chan...

We report direct observation of controlled and reversible switching of magnetic domains using static (dc) electric fields applied in situ during Lorentz microscopy. The switching is realized through electromechanical coupling in thin film Fe(0.7)Ga(0.3)/BaTiO(3) bilayer structures mechanically released from the growth substrate. The domain wall motion is observed dynamically, allowing the direc...