Bimagnetic FePt/CoFe2O4 nanoparticles having a bricklike morphology were synthesized by growing a soft magnetic CoFe2O4 phase on FePt cubic nanoparticle seeds. The size of the soft phase could be controlled by tuning the material ratio of the FePt seeds to the CoFe2O4 component. To obtain magnetic hardening, the as-synthesized bricklike nanoparticles were annealed at elevated temperatures under...

In this paper we report results on the synthesis and magnetic properties of L10 FePt nanocomposite fi lms. Three fabrication methods have been developed to produce high-anisptropy FePt fi lms: non-epitaxial growth of (0 0 1)-oriented FePt:X (X=Ag, C) composite fi lms that might be used for perpendicular media; monodispersed FePt(CFx) core–shell nanocluster-assembled fi lms grown with a gas-aggr...

Hard/soft magnetic bilayer thin films have been widely used in data storage technologies and permanent magnet applications. The configuration response to temperatures fields these heterostructures are considered be highly dependent on the interfacial coupling. However, intrinsic properties of each layers, such as saturation magnetization layer thickness, also strongly influence configuration. C...

In this paper, we illustrate how to modify the structure and magnetic properties of L10 FePt and PtMn films using ion-beam irradiation. Highly ordered L10 FePt and PtMn phases were achieved directly by using 2 MeV He-ion irradiation without conventional post-annealing. A high ion-beam current density (~μA/cm ) was used to achieve direct beam heating on samples. This irradiation-induced heating ...

Controlled microrobotic navigation in the vascular system can revolutionize minimally invasive medical applications, such as targeted drug and gene delivery. Magnetically controlled surface microrollers have emerged a promising platform for circulatory system. Locomotion of micrororollers strong flow velocities is highly challenging task, which requires magnetic materials having actuation prope...

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Many approaches had been reported to successfully reduce the transition temperature of FePt from A1 to L10 phase, though without detailed knowledge. In this work, we deposited the metastable AgPt layer adjacent to the Fe layer and addressed the importance of vacancies in the disorder–order transition of FePt at reduced temperatures on the basis of a kinetic diffusion model. The decomposition of...

FePt nanocrystals with sizes ranging from 2 to 20 nm are an important class of magnetic nanomaterials.1 The promising applications in data storage, high performance permanent magnets, biomedicine, and catalysis promote extensive synthetic effort. To date, most of previous work has focused on the synthesis of spherical or cubic FePt nanocrystals.2 One-dimensional FePt nanoparticles (nanorods or ...

Thin films of oriented tetragonal FePt particles separated by amorphous alumina have been fabricated by electron beam evaporation. The ordering of the FePt particles without coarsening can be tailored by annealing conditions. The value of coercivity of the annealed film reached as high as 4.4 kOe. The perpendicular magnetic coercivity of the annealed film was slightly larger than in-plane coerc...