We have investigated the magnetism of NiFe/CoO/Co trilayers with different CoO spacer thicknesses. The dependence of the coercivity (Hc) and exchange bias field (Hex) on the CoO thicknesses indicated that different pinning strengths from the CoO were acting on the top NiFe and bottom Co layers, respectively. DC susceptibility indicated the different interlayer coupling energies and showed that ...

Abstract— This paper develops a method of modelling and designing air-gapped ferrite inductor as filter for large current application of grid-tied inverter. The design method incorporates magnetization curve of the ferrite materials while the modelling of the inductor is based on inverse JilesAtherton model. The dynamic performance of the designed ferrite inductor in the DC-AC inverter circuit ...

We have performed a series of measurements to study the low temperature dynamics of an interacting magnetic nanoparticle system. The results obtained demonstrate striking memory effects in the dc magnetization and magnetic relaxation that support the existence of a spin-glass-like phase in interacting magnetic nanoparticles. Moreover, we observe an asymmetric response with respect to temperatur...

An azido-bridged chair-like decanuclear cluster: [Co(II)10(bzp)8(Metz)2(N3)18]·4MeOH·3H2O (1, bzp = 2-benzoylpyridine and HMetz = 5-methyl-1H-tetrazole) was prepared with in situ tetrazolate anions as templates in a sealed system. 1 containing both octahedral and tetrahedral Co(II) ions exhibited slow relaxation of magnetization with an effective barrier of 26 K under an applied dc field of 1 kOe.

Superconducting MgB2 thin films have been fabricated by 80 keV B ion implantation into commercial Mg ribbon with B doses up to 10 ions/cm, followed by thermal annealing at 500 °C. Temperature dependent dc magnetization measurements confirmed superconducting phase transitions between 11 and 18 K for samples containing nanocrystalline MgB2 grains embedded in Mg substrate with a small amount of Mg...

We present analytical and numerical calculations of dynamic magnetization states of a spin valve in the presence of dc and ac currents. Three distinct dynamic phases, synchronization, modification, and chaos, are identified within the experimental parameter space. A particularly interesting result is the appearance of the synchronization-chaos boundaries. In the region of synchronization, our r...

We have investigated various kinds of random magnets, such as competing spin anisotropy systems and spin glass systems by measuring dc-magnetization, ac-susceptibility, Mössbauer spectrum, neutron scattering intensity and μ+SR time spectrum. By adducing some examples, we have demonstrated that the combination of several methods mentioned above is very useful for understanding the static and dyn...

A single crystal of U2NiSi3 was investigated by means of magnetization, electrical resistivity and heat capacity measurements. Whereas the DC magnetic data clearly manifest strongly anisotropic ferromagnetism, the AC magnetic susceptibility data are consistent with spin-glass behaviour, reported previously for polycrystalline samples. Moreover, no distinct anomalies around TC occur in the speci...

In the first part of this thesis, we study the magnetization reversal process of FePtnanowires with high magnetocrystalline anisotropy. When reducing the wire width below themean dendrite width, the magnetization reversal favors a transition from the dendrite growth tothe propagation of a single domain wall (DW). Further decreasing of the width towards thedisorder length and/or ...

A method is presented for the synthesis of high-quality nickel nanoparticles. Laser-driven decomposition of nickel carbonyl vapors is used to produce particles in the form of an aerosol, followed by exposure to a solvent containing an appropriate surfactant to yield a stable dispersion of particles. This method is scalable and yields a substantially monodisperse distribution of particles at a r...