Magnetic structure and magnetization process of the glass-coated Fe-based amorphous microwire

Abstract

Articles you may be interested inMagnetic field and mechanical stress tunable microwave properties of composites containing Fe-based microwires Appl. Phys. Lett.Size triggered change in the magnetization mechanism of nearly zero magnetostrictive amorphous glass-coated microwires Stress induced magnetic anisotropy and giant magnetoimpedance in Fe-rich glass-coated magnetic microwires Magnetic structure of amorphous Fe 73,9 B 13,2 Si 10,9 C 2 microwires was studied. The magnetic structure of the as-prepared microwire was found to consist of a magnetic core and a ring-shaped surface magnetic layer made up by radially magnetized small ring domains. The geometric characteristics of microwire magnetic structure were first experimentally determined. The width of the surface ring domains is about 5 lm, and the thickness of the surface magnetic layer is 2 lm. The magnetic core of the as-prepared microwire has been shown to consist of extensive domains, no less than 500 lm in size, and their spontaneous magnetization vector deviating from the microwire axis. The effect of magnetostriction on magnetic structure and its changes induced by magnetization has been established. The magnetic structure model for microwires with positive magnetostriction constant is proposed.

Magneto-Optical Study of the Surface Reversal Process in Amorphous Glass-Coated Microwires With Positive Magnetostriction

“…black part of magnetic contrast disappearing over a total length of around 120 μm (apparent surface domain wall length). Such tilted surface domain wall structure could be attributed to the tilted domain wall, which was previously predicted and observed in glass-coated microwires [20]- [22]. This tilted surface structure of the domain wall was observed along the entire length of 2 cm piece of the sample.…”

Effect of Current Annealing on Domain Structure in Amorphous and Nanocrystalline FeCoMoB Microwires

“…Additionally, strong circular anisotropy is induced during current annealing which also leads to the increase of thickness of outer shell that consists of many adjacent strips with different orientation of magnetization (radial and circular ones) as is schematically depicted in Fig. 1, which has been experimentally observed in amorphous microwires, see for example in [13,14]. As a result of such annealing thickness of outer shell almost linearly increases while values of the switching field exhibit slightly decreasing tendency.…”

Dependence of the magnetic properties of micro- and nanowires on their temperature treatment

“…It was shown earlier [2] that the domain structure of CGC MNW can be presented schematically as two domains that are separated by a 180° wall in the form of a cylin drical surface. However, in [12], another model is pro posed by the authors based on magneto optic mea surements that contradicts (as will be shown below) a number of experimental facts and theoretical conclu sions. Regardless of the accepted magnetic model, but in the framework of one of them, there are two mech anisms of deceleration of the domain wall.…”

“…One of them is described in [6,7] and the other in [10,11]. The theoretical justifications of the magnetic model in [12] and the mechanisms of the domain wall decelera tion in [10,11] are partially based on incorrect calcu lations of the residual stresses. This fact has already been mentioned in [2].…”

“…In the following chapter, the domain structures of [12] and [2] will be compared, which will allow us to select the magnetic model for the CGCMNW.…”