Addition of molybdenum into amorphous glass‐coated microwires usable as temperature sensors in biomedical applications

Abstract

Compared to other sensors, such as radio‐frequency identification sensors, microwires have a significant advantage due to their small dimensions and contact‐free reading. The most important advantage is that a microwire is considered to be a biocompatible material due to the glass‐coating insulator. This is particularly applicable in various titanium implants (dental, knee joint, replacement of damaged skull part, repair of the femur, etc.). The temperature dependence of the switching field can be employed to monitor inflammatory processes. In this contribution we present the influence of molybdenum (Mo) content on the magnetic properties and thermal treatment in order to obtain a strong variation of the switching field to temperature. We show that stress annealing of a FeMo9BCu microwire at 775 K under an applied axial stress of 309 MPa leads to the strongest variation in a temperature range from 300 to 315 K, which is highly desirable for biomedical applications.

Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors

“…Magnetic and magnetoelastic sensors and composites utilizing soft magnetic wires with giant magnetoimpedance (GMI) present extremely high sensitivity to external stimuli, such as magnetic field, stress or temperature, making them suitable for many applications [1][2][3][4][5][6][7]. Most of the emerging applications request reduced dimensionality, combined with excellent soft magnetic properties, superior mechanical properties, enhanced corrosion resistance and biocompatibility [7][8][9][10][11][12]. Generally, amorphous materials, and particularly amorphous magnetic wires, present the best combination of soft magnetic properties and superior mechanical characteristics [13,14].…”

“…Generally, amorphous materials, and particularly amorphous magnetic wires, present the best combination of soft magnetic properties and superior mechanical characteristics [13,14]. The other functional properties, like reduced dimensionality, improved corrosion resistance and biocompatibility have been achieved in amorphous microwires coated by flexible and insulating glass-coating [8][9][10][11][12]14]. Therefore, studies of amorphous wires gained considerable attention since the 1970s [1][2][3][4][5][8][9][10].…”

Novel Applications of Bistable Magnetic Microwires

“…One of the first possible applications is the use of microwire to sense the temperature in titanium implants in order to sense the possible inflammation process [7]. In such case, microwires with high sensitivity in a narrow temperature range (35-45…”

Estimation of Multichannel Magnetometer Noise Floor in Ordinary Laboratory Conditions

“…Although there are some rules to follow, this method is relatively simple and is based on the statistical data processing and spectral analysis. This method can be used to estimate noise also for different types of sensors, also for novel magnetic microwire sensors in biomedical applications [7].…”