Magnetic Sensors Based on Tuned Varistors of Ilmenite‐Hematite, IHC45, Oxide Semiconductor

Pandey, R. K.; William, Ashraf; Stapleton, William A.; Sutanto, Ivan

doi:10.1002/9781119183860.ch13

Cited by 1 publication

(1 citation statement)

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“…The magnetoresistance (MR) effect is the core of magnetic recording and sensor technology, particularly in automobile, digital, and communication industry. Previous researches have already proven that the MR effect was not only related to the material property, but also closely affected by the geometry structure of samples .…”

Section: Introductionmentioning

confidence: 99%

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO₂/Si

Dong

Zheng

et al. 2019

Adv Elect Materials

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Magnetic materials are commonly used in the research of Corbino magnetoresistance. [17,18] Since the recent discoveries of large geometric magnetoresistance effect in non-magnetic semiconductors, [19][20][21][22] especially silicon, [23,24] there has been a technological and fundamental interest in this phenomenon. Theoretically, several models have been proposed to explain the basic mechanism, which generally conclude that the basic cause of the effect is unevenly carrier distribution and the bending of current path. [25][26][27] As an effectual method to change and adjust the carrier distribution, photoelectric effect provides a novel solution. The contribution of photoinduced carriers to magnetoresistance is rarely reported.Based on the above ideas, we prepared a set of nonmagnetic Corbino type disks of Cu/SiO 2 /Si structure. This distinctive structure presents huge magnetoresistive effect with the combined application of laser and magnetic field. The magnetoresistance attains 491% at 2.1T and still tends to rise with the increase of the magnetic field. This result is comparable to other researches on Corbino magnetoresistance for magnetic and nonmagnetic materials. [17,28] We attribute this pheno menon to the increase of photoinduced carriers and the bending of their diffusion path. Compared with our previous research on the magnetoresistance effect in rectangular slit structure, [26] Corbino disk would not truncate and accumulate photoinduced carriers since its circular asymmetry structure, and the magnetoresistance can be regulated by the thickness of metal film in the ring groove. This tunable magnetoresistance effect may provide a new approach for the development of magnetoresistive device. Figure 1a shows the structure of Corbino disk. r 1 and r 2 are the inner radius and outer radius, respectively. The Cu layers were deposited on n-type Si (111) substrates (with a 1.2 nm native oxide layer) by DC magnetron sputtering at room temperature. The thickness of Si wafers is about 3 mm and the resistivity is 50-80 Ω cm. The center and peripheral regions of the disk are Cu bulk layers with the thickness of 22.5 nm, which ensure the resistance is low enough. [26] And the part The Corbino disk is used to study magnetoresistance as it eliminates Hall-voltage interference and allows for direct probing of bulk properties. A laser-triggered magnetoresistance effect in the Corbino disk of a Cu/ SiO 2 /Si structure is reported. When a laser is applied, the magnetoresistance is greatly improved, by 360 times, under a 635 nm laser and a 2.1T magnetic field. In addition, the effect shows a close connection with the geometry of the nanoscale metal-film structure. This effect is attributed to an increase in carrier concentration and bending of the motion path under the laser and magnetic field. This work suggests a new approach for the exploration of the magnetoelectric properties of nanoscale metal films and opens a new window on the use of light to adjust magnetoresistance devices. Fabrication and Methods

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Section: Introductionmentioning

confidence: 99%

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO₂/Si

Dong

Zheng

et al. 2019

Adv Elect Materials

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Magnetic Sensors Based on Tuned Varistors of Ilmenite‐Hematite, IHC45, Oxide Semiconductor

Cited by 1 publication

References 23 publications

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO₂/Si

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO₂/Si

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Magnetic Sensors Based on Tuned Varistors of Ilmenite‐Hematite, IHC45, Oxide Semiconductor

Cited by 1 publication

References 23 publications

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO2/Si

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO2/Si

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Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO₂/Si

Laser‐Triggered Large Magnetoresistance Change Observed in Corbino Disk of Cu/SiO₂/Si