Shaoxiong Zhou

Advances in Investigation of Fe-based Glass-forming Alloy Melts

Continuous precision casting is an important trend in modern industrialization. Clustering effects in glass-forming metallic liquids tremendously influence the properties of rapidly quenched ribbons; therefore, much attention has been paid to the study of Fe-based glass-forming melts at high temperatures. Recent investigations of these melts are categorized and reviewed. It is concluded that more efforts are still required to reveal the discipline of amorphization brought about by rapid quenching of Fe-based glass-forming melts.

Structural, magnetic, and electronic properties of Fe 82 Si 4 B 10 P 4 metallic glass

The structural, magnetic, and electronic properties of Fe82Si4B10P4 metallic glass were systemically investigated by theoretical simulations. Strong atomic interaction between Fe and metalloid atoms can be observed, while the direct metalloid-metalloid atomic bonds are rare due to the solute-solute avoidance effect. The calculated value of saturation magnetic flux density (BS) is ~1.65 T, approaching to experimental result, which is contributed by not only the electron exchange between Fe and metalloid atoms, but also the p-d orbital hybridization of Fe atoms. Moreover, Fe atoms with neighboring P atom behaving larger magnetic moments reveals the important role of P element for promoting the BS value. The potential correlation between magnetic behaviors and the local atomic packing in this study sheds some light on the structural origin of the soft magnetic properties and, thereby the theoretical guidance for the development of new soft-magnetic metallic glasses.

Highly Ductile and Ultra-Thick P-Doped FeSiB Amorphous Alloys with Excellent Soft Magnetic Properties

Herein, we demonstrate the successful synthesis of novel Fe80Si9B(11−x)Px (x = 0, 1, 3, 5, 7) ultra-thick amorphous ribbons by planar flow casting. The influence of P alloying on glass forming ability (GFA), microstructure, thermal stability, soft magnetic properties, and ductility has been systematically investigated. The results reveal that introduction of P into Fe80Si9B11 alloy can remarkably enhance the GFA and increase critical thickness (tc) of the alloy from 45 to 89 um. Furthermore, the annealed FeSiBP amorphous alloys exhibited excellent soft magnetic properties, including high saturation magnetic flux density of 1.54 T, the low coercivity of 1.5 A/m, and low core losses of 0.15 W/kg. In addition, the representative Fe80Si9B8P3 ultra-thick amorphous alloy demonstrate excellent ductility even after annealing at 400 °C for 10 min, which indicates the superior performance of P-doped FeSiB alloys as compared to the commercial Fe78Si9B13 (Metglas 2605 S2) alloy. The combination of high GFA, excellent ductility, and low core losses of newly developed FeSiBP amorphous soft magnetic alloys makes them attractive candidates for magnetic applications in the high-frequency and high-speed electric devices.

Multiple modulations of strain- and charge-mediated converse magnetoelectric coupling effects in a STO/Fe3O4/Au/PZT multiferroic heterostructure

The multiple modulations of strain- and charge-mediated converse magnetoelectric coupling effects have been achieved in a multiferroic heterostructure of SrTiO3(STO)/Fe3O4/Au/PbZr0.52Ti0.48O3(PZT) multilayers grown on a Nb:SrTiO3 substrate. By altering the position of the applied electric field, the heterostructure is divided into three structure parts, i.e., Fe3O4/Au/PZT, STO/Fe3O4, and STO/Fe3O4/Au/PZT. In such an optimized heterostructure, the strain and charge effects can be directly separated, quantified, and co-regulated and the pure strain, pure charge, and the combined strain and charge effects can thus be obtained, respectively. The in-plane magnetization variation behaviors induced by electric fields are different for the three individual modulations, which are closely related to the interfacial strain propagation and interfacial charge accumulation. It is also found that the strain and charge effects can interact with each other as the two interfacial effects coexist.The multiple modulations of strain- and charge-mediated converse magnetoelectric coupling effects have been achieved in a multiferroic heterostructure of SrTiO3(STO)/Fe3O4/Au/PbZr0.52Ti0.48O3(PZT) multilayers grown on a Nb:SrTiO3 substrate. By altering the position of the applied electric field, the heterostructure is divided into three structure parts, i.e., Fe3O4/Au/PZT, STO/Fe3O4, and STO/Fe3O4/Au/PZT. In such an optimized heterostructure, the strain and charge effects can be directly separated, quantified, and co-regulated and the pure strain, pure charge, and the combined strain and charge effects can thus be obtained, respectively. The in-plane magnetization variation behaviors induced by electric fields are different for the three individual modulations, which are closely related to the interfacial strain propagation and interfacial charge accumulation. It is also found that the strain and charge effects can interact with each other as the two interfacial effects coexist.

Influence of pulsed current on giant magneto-impedance effect in Fe73.5Cu1Nb3Si13.5B9 amorphous wires

The magneto-impedance (MI) effect in amorphous and current annealed Fe73Cu1Nb3Si13.5B9 wires has been measured to investigate the influence of DC annealing, high-current-density electropulsing annealing and tensile stress on it. The results show that the MI of DC annealed sample exhibits sharp maximum at H-ex = H-k, Maximum MI ratio of 60% is observed in sample of high-current-density electropulsing annealed under applied tensile stress