Nano-composite permanent magnetic material is a new type permanent magnetic material, and it is the synthesis of soft and hard magnetic phase within nanoscale. On the basis of exchange coupling hard magnetizing theory, nano-composite permanent magnetic material can at the same time have high residual magnetization intensity of soft magnetic phase and high coerccivity of hard magnetic phase, and...

observed by Meiklejohn and Bean1 (cobalt particles in shells of antiferromagnetic cobalt oxide); both are inhomogeneous and the coexistence of a ferromagnetic and an antiferromagnetic phase gives rise to large exchange bias. This demonstration of tuning the composition of certain Heusler alloys to attain exceptionally high exchange bias fields indicates a route for designing rare-earth-free har...

The exchange coupling between a hard magnetic layer MnBi and soft Co-Fe has been found to significantly improve the maximum energy product. In this work, spin structure of exchange-coupled MnBi:Co-Fe bilayers is experimentally investigated by X-ray circular dichroism (XMCD) polarized neutron reflectometry (PNR). We find that out-of-plane magnetization reversal process bilayer involves formation...

Cerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems poorly understood due difficulty quantitative description Kondo effect, many-body phenomenon where conduction electrons screen out Ce-4f moment. Here, we sh...

This paper reviews recent developments in research in nanostructured permanent magnets (hard magnetic materials) with emphasis on bottom-up approaches to fabrication of hard/soft nanocomposite bulk magnets. Theoretical and experimental findings on the effects of soft phase and interface conditions on interphase exchange interactions are given. Synthesis techniques for hard magnetic nanoparticle...

The conventional ceramic route was utilized to prepare a hard magnetic powder (M-type strontium ferrite, SrFe12O19). The stoichiometric mixture of iron oxide and strontium carbonate were calcined at 1000C and then fired at various temperatures. The influence of various reaction parameters such as mixing ratio, calcination temperature, firing temperature and firing time on the magnetic behaviors...

– Magnetic relaxation in a type-II superconductor is simulated for a range of temperatures T in a simple model of 2D Josephson junction array (JJA) with finite screening. The high-T phase, that is characterised by a single time scale τα, crosses over to an intermediate phase at a lower temperature Tcr wherein a second time scale τβ ≪τα emerges. The relaxation in the time window set by τβ follow...

The anomalous Hall effect of wires patterned from (Co{90}Fe{10}/Pt){n} multilayers, with 10<or=n<or=50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1/f noise appears in samples with a quality factor Q<1 at points on the hysteresis loop where the magnetization reverses continuously. The magnetic noise is associated with reversible excursions...