Soft Magnetic Amorphous Microwires for Stress and Temperature Sensory Applications

Abstract

Amorphous ferromagnetic materials in the form of microwires are of interest for the development of various sensors. This paper analyzes and argues for the use of microwires of two basic compositions of Co71Fe5B11Si10Cr3 and Fe3.9(4.9)Co64.82B10.2Si12Cr9(8)Mo0.08 as stress/strain and temperature sensors, respectively. The following properties make them suitable for innovative applications: miniature dimensions, small coercivity, low anisotropy and magnetostriction, tunable magnetic structure, magnetic anisotropy, and Curie temperature by annealing. For example, these sensors can be used for testing the internal stress/strain condition of polymer composite materials and controlling the temperature of hypothermia treatments. The sensing operation is based on the two fundamental effects: the generation of higher frequency harmonics of the voltage pulse induced during remagnetization in wires demonstrating magnetic bistability, and magnetoimpedance.

An Indirect Method of Micromagnetic Structure Estimation in Microwires

“…The amorphous microwires of Co 70 Fe 4 B 13 Si 11 Cr 2 alloy with near-zero magnetostriction [ 37 , 38 ] produced by Tailor-Ulitovsky technique [ 39 ] with different metal cross-section dimensions from 6.4 to 28 µm (6.4, 8, 8.5, 10, 22 and 28 µm) were investigated. The glass shell had the thicknesses of 2.5, 2.8, 2, 2.3, 1, and 3 µm, respectively.…”

Regulable Properties in Multicomponent Rare Earth Magnetic Particle SmxPr1–xCo5 by a Specially Designed Co Nanomatrix Precursor: Implications for Magnets with Different Application Temperatures

“…Many efforts have been made to obtain RE-Co particles with controllable magnetic properties by physical and chemical methods. ,− Pr doping in SmCo 5 is expected to obtain optimal magnetic performance, while the difficulty lies in controlling the composition homogeneity in multicomponent rare earth particles. Relative to physical methods, chemical methods are conducive to regulating particle size and morphology, which have a considerable impact on magnetic properties. − However, the preparation of RE-based particles by direct solution-based chemical synthesis is blindingly challenging because of the antioxidant chemical instability of RE.…”

The Influence of Internal Stress on the Nanocrystal Formation of Amorphous Fe73.8Si13B9.1Cu1Nb3.1 Microwires and Ribbons

“…This difference in the stress state not only affects the magnetization reversal process and the shape of a hysteresis loop [7,8] but it should also affect the processes of crystal formation at the initial stages. Previously, the effect of mechanical stresses on the crystallization and magnetic properties of Co-rich microwires was observed in [9][10][11]. It was found that isothermal annealing led to the formation of crystallites with an elongated shape, and there existed a preferential orientation along the microwire axis [12].…”

“…It was shown that the growth of crystals oriented along the microwire axis led to a giant increase in the coercivity (by an order of magnitude or more). Moreover, the cumulative effects of stresses on the crystallization and high-frequency properties of microwires was demonstrated in [11].…”