Bistable magnetization reversal in 50 µm diameter annealed cold-drawn amorphous wires

Malmhäll, R.; Mohri, K.; Humphrey, F. B.; Manabe, T.; Kawamura, H.; Yamasaki, J.; Ogasawara, I.

doi:10.1109/tmag.1987.1065479

Cited by 49 publications

(16 citation statements)

References 5 publications

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“…The Wiegand effect has certain advantages: it does not need any external power supply, and the amplitude of the pulse voltage is still large at both high and low frequencies, while an ordinary sinusoidal electromotive force depends on the frequency of the applied magnetic field. This phenomenon has been used in many sensor applications, such as rotation sensors and speed sensors 2,3) . Further, vibration-type energy-generating elements by exciting the magnetic wire through a single magnet are being developed 4,5) .…”

Section: Introductionmentioning

confidence: 99%

Power Supply for Medical Implants by Wiegand Pulse Generated from Magnetic Wire

et al. 2018

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Implantable medical devices are utilized in the human body for maintaining good health. As these devices are becoming increasingly functionalized, supplying power to them has become very important. Instead of batteries, technologies for wireless power supplies are being developed, such as inductive coupling or piezoelectric elements. However, we propose the use of magnetic wires for this purpose. Inside these wires, a fast magnetization reversal, called a "large Barkhausen jump," occurs due to an applied magnetic field. This reversal induces a large pulse voltage in pick-up coils, which is called a "Wiegand pulse." By applying this pulse as an electric source, a higher electric power is expected compared with the conventional method using a sinusoidal excitation field. A wire core coil was prepared, and open-circuit voltage was measured. In addition, DC voltage and electric power were measured by connecting the wire core coil to a rectifier. The experimental results confirmed the superiority of using a Wiegand pulse at an applied magnetic field intensity of 60 Oe and a frequency of lower than 10 kHz.

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Section: Introductionmentioning

confidence: 99%

Power Supply for Medical Implants by Wiegand Pulse Generated from Magnetic Wire

et al. 2018

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“…A magnetic sensor that uses the Wiegand effect has certain advantages: no external power supply is necessary, and the amplitude of the pulse voltage does not depend on the frequency of an applied magnetic field. This phenomenon has been used in various sensor applications, including speed sensor and rotation sensor 2,3) .…”

Section: Introductionmentioning

confidence: 99%

Reduction of vibration amplitude in vibration-type electricity generator using magnetic wire

2017

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A fast magnetization reversal accompanied by a large Barkhausen jump in a magnetic wire is utilized in speed sensors, rotation sensors, and other applications. This magnetization reversal induces a pulse voltage in a pick-up coil, which can also be applied for electricity generation as an energy-harvesting element. Dependence of the output voltage on the position of the pick-up coil indicated a fast magnetization reversal by a domain wall propagation. An excitation method for a vibration-type electricity-generating element using a single magnet was optimized by changing the magnet size. The output voltage obtained from the FeCoV wire depended on the amplitude of vibration of an excitation magnet. In order to minimize the vibration amplitude of an excitation magnet required for generating the output voltage, a field distribution from magnets of various sizes was calculated. It was found that just a 0.6 mm-movement of an NdFeB magnet was sufficient to generate the output voltage.

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“…Here we deal with cold-drawn wires [3], produced from the as-cast 120 mm thick wires by cold drawing, where internal stresses are quite strong. As a consequence, magnetic properties of cold-drawn wires can be unusual.…”

Section: Introductionmentioning

confidence: 99%