@@Half metallic materials have recently attracted much attention due to their high spin polarization, important for research and application in spintronics . As a promising candidate, ultrathin films of magnetite Fe...
@@Half metallic materials have recently attracted much attention due to their high spin polarization, important for research and application in spintronics . As a promising candidate, ultrathin films of magnetite Fe3O4 have motivated numerous investigations on their structure and magnetic properties. In this paper, we report the investigations on growth and magnetic properties of ultrathin monocrystalline Fe3O4 films on GaAs(100) and InAs(100).
@@ Magnetic nanoparticles (NPs) represent a critical link between current technology and the next generation of magnetic materials, because of their intriguing physical properties including superparamagnetic behavior....
@@ Magnetic nanoparticles (NPs) represent a critical link between current technology and the next generation of magnetic materials, because of their intriguing physical properties including superparamagnetic behavior. The physics of magnetic NPs is a vivid topic of modern magnetism research. Since it is very difficult to investigate single superparamagnetic nanoparticle in experiment with current technology, a collective system comprised of perfectly-isolated magnetic nanoparticles with uniform size, shape, and interspacing is an ideal research object to reveal the complex magnetism at nanoscale. So there has been a great challenge: controlling the size, shape, and interparticle spacing, and thus dipolar interaction, for each particle even in a dense particle system. Recently, magnetic NPs prepared by chemical synthesis routes generally have a good uniformity and control over size and shape, which can resolve various effects previously obscured by the inhomogeneous broadening due to wide size-distribution or diverse shape and has significantly advanced the studies of nanomagnetism. However, the control on the interspacing of NPs currently by dispersion of NPs in insert media such as SiO2, a polymer matrix, and a liquid suspension, and by self-assembly array is very difficult to completely avoid aggregation in order to obtain isolated NPs and to control well the interparticle spacing.
The magnetic materials with large magnetocaloric effect have attracted considerable attention for magnetic refrigeration applications. Recently, Gd based soft magnetic amorphous alloys have been proposed as promising ...
The magnetic materials with large magnetocaloric effect have attracted considerable attention for magnetic refrigeration applications. Recently, Gd based soft magnetic amorphous alloys have been proposed as promising candidates for magnetic refrigeration. Owing to the amorphous nature, they exhibit some special advantages such as the negligible magnetic hysteresis losses and tunable Curie temperature Tc. Zhang et al.(1' found that two successive magnetic-entropy changes occur in the compounds Gd4Co3 due to a spin-reorientation transition at Tsr=163 K and a ferrimagnetic-magnetic ordering transition at 7c=220K. In this work, the magnetic properties and magnetocaloric effect of amorphous (Gd4Co3)95 alloy are investigated. The nature of the ferrimagnetic to paramagnetic phase transition was performed a critical exponent study.
@@ The micro magnetic structures and magnetization processes of perpendicularly-oriented Y3Fe5O12 (yttrium ion garnet: YIG) films were studied using Lorentz microscopy and electron holography [1]. The closure magnetic...
@@ The micro magnetic structures and magnetization processes of perpendicularly-oriented Y3Fe5O12 (yttrium ion garnet: YIG) films were studied using Lorentz microscopy and electron holography [1]. The closure magnetic domain structure inside the thin specimens of transmission electron microscope (TEM) exhibits the same period as that of the magnetization pattern observed by magnetic force microscopy,indicating the perpendicular anisotropy characteristic of the YIG film. Observation of stray magnetic fields outside the sample shows that the shapes of domains and domain walls are sensitive to the specimen thickness. In addition, a closure domain configuration observed in thin specimens is the energetically stable state determined by the balance between the crystalline anisotropy energy and shape anisotropy energy.
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