Assembled Fe3O4 nanoparticles on graphene for enhanced electromagnetic wave losses Appl. Phys. Lett. 101, 153108 (2012) Magnetization reversal and magnetoresistance behavior of perpendicularly magnetized [Co/Pd]4/Au/[Co/Pd]2 nanowires J. Appl. Phys. 112, 073902 (2012) Electric-field control of CoFeB/IrMn exchange bias system J. Appl. Phys. 112, 064120 (2012) Critical effect of spin-dependent transport in a tunnel barrier on enhanced Hanle-type signals observed in threeterminal geometry Appl. Phys. Lett. 101, 132411 (2012) Giant tunneling magnetoresistance in epitaxial Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions by halfmetallicity of Co2MnSi and coherent tunneling

It is revealed by the finite difference time domain simulation that a cross aperture antenna can create a localized circularly polarized light, 10 nm in diameter, on the surface of a recording medium. The confined circularly polarized light on the surface, however, expands in the recording layer. We eventually find that the newly proposed modified cross aperture in combination with particle medium leads to confinement of a circularly polarized light in the particle. This proposed combination of a surface plasmon antenna/aperture and recording particles is one of the strategies to achieve high speed and high density for all-optical magnetic recording.

A novel algorithm is proposed for solving coupled Maxwell and Schrödinger equations relying on the use of a length gauge form of the coupling between an electromagnetic field and electrons. Numerical simulations using codes implemented with the proposed and conventional algorithms have been performed for a harmonic model of a nanoplate subjected to a pulsed laser field whose central frequency is close to the plasmon frequency. We verify that the proposed algorithm can reduce computational time almost by half as compared with the conventional method. Figure 4. Relative error « of the time-dependent probability density measured at y = 0, | c (y = 0, t)| 2 for an electron confined by a 1D harmonic oscillator potential. in 2002. His research interest is concerned with computational electromagnetics. 544 S. OHNUKI ET AL.

The microscopic origin of the uncompensated antiferromagnetic (AFM) spins was investigated by means of the x-ray magnetic circular dichroism (XMCD) spectroscopy with transmission mode for Mn–Ir/ferromagnetic (FM) bilayers. As the AFM layer thickness increases, resonant absorption magnitude of Mn L edge naturally increases, but the XMCD magnitude does not change so much. When the FM layer material is modified, the XMCD signal of Mn L edge drastically changes not only in its magnitude but also in its sign. The XMCD signal vanishes without the FM layer. These facts clearly mean that the uncompensated Mn components are induced through the exchange interaction between the FM and the AFM layers and are localized at the very interface. Micromagnetic simulation within the framework of the classical Heisenberg model well supported the above conclusion.

Effects of ultra-thin Mn, Ru, Pd, Ta, Gd, and Tb layer insertion at the interface on the exchange bias of Mn 75 Ir 25 /Co 70 Fe 30 bilayers were investigated. Unidirectional anisotropy constant, J K , of the bilayer was significantly enhanced from 0.46 erg/cm 2 to 0.84 erg/cm 2 with the insertion of 0.5-nm-thick Mn layer, while it was reduced with increasing the inserted layer thickness for the other materials. The value of 0.84 erg/cm 2 was not obtained in the variation of J K with respect to the chemical composition of Mn-Ir layer in a range of Ir content of 0 ~ 40 at.%. The cause of the enhancement of J K with ultra-thin Mn insertion might be due to the modification of antiferromagnetic spin structure at the interface.

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Abstract-In this paper, we investigate electromagnetic problems for nanoscale antennas by using a boundary integral equation method with fast inverse Laplace transform. The antennas are designed for realizing ultra-fast and high-density magnetic recording. Characteristics of nanoscale antennas are discussed in terms of eigenmodes and time domain responses of electric fields. Our computational method is highly efficient and the computational cost can be reduced by selecting coarse time-step size and performing parallel computation.

The magnetic response of surface plasmon polaritons (SPPs) has the potential to be utilized as a magnetic sensor. To this end, a non-solid solution material (Ag-Co system) was selected for evaluation, as such materials are expected to efficiently excite the SPPs, while also highly increasing the magnetic sensitivity with a single layer. In the Ag-Co non-solid solution film, Ag is a good SPP excitation material, whereas Co is a ferromagnetic material. The excitation and magnetic response of the SPPs in Ag-Co single layer films were investigated by varying the film thickness and wavelength, from which it was found that the optimal characteristics for both were obtained with films 35-50 nm thick. The largest magnetic response of the SPPs, as defined by the ratio of reflectivity change under the applied magnetic field between zero and 400 mT, was determined as ~0.29. The Ag-Co non-solid solution system therefore represents a good material for obtaining a large magnetic response of SPPs.