Abstract
The magnetic characteristics of FINEMET type glass-coated nanowires and submicron wires are investigated by taking into account the structural evolution induced by specific annealing all the way from a fully amorphous state to a nanocrystalline structure. The differences between the magnetic properties of these ultrathin wires and those of the thicker glass-coated microwires and “conventional” wires with similar structures have been emphasized and explained phenomenologically. The domain wall propagation in these novel nanowires and submicron wires, featuring a combination between an amorphous and a crystalline structure, has also been studied, given the recent interest in the preparation and investigation of new materials suitable for the development of domain wall logic applications.
Highlights
Long cylindrical ferromagnetic wires with excellent soft magnetic properties [1,2] have been of interest for numerous applications, mainly in sensing devices such as electrical current and magnetic field sensors aimed for medical and automotive uses [3,4,5]
The employed preparation methods include various rapid solidification techniques, which led to magnetically soft amorphous wires with different dimensions
The precursor amorphous Fe73.5 Cu1 Nb3 Si13.5 B9 submicron wires and nanowires, with diameters ranging between 100 and 900 nm and the glass coating thickness of 5 μm, have been prepared by means of glass-coated melt spinning [14], with the necessary improvements that allowed a significant reduction in the diameter of the actual magnetic wires [31]
Summary
Long cylindrical ferromagnetic wires with excellent soft magnetic properties [1,2] have been of interest for numerous applications, mainly in sensing devices such as electrical current and magnetic field sensors aimed for medical and automotive uses [3,4,5]. The glass-coated amorphous microwires, prepared by means of glass-coated melt spinning [14], display much smaller diameters of the magnetic wire, ranging from 1 to 50 μm. These are composite materials, since the actual magnetic wires are directly obtained in an insulating glass coating, which has a thickness of 1 to 50 μm itself. Both the ‘conventional’ and the glass-coated samples are prepared through continuous processes, which result in very long wires
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