Magnetoresistive and magnetostrictive sensors for the mobile era
Abstract/Contents
- Abstract
- Magnetoresistance is the property of a material to change the value of its electrical resistance in an external magnetic field, which has been utilized in a variety of sensing applications. Magnetostriction is the phenomenon of a magnetic body to change its shape and dimension as a function of an applied magnetic field. Magnetostrictive materials have been widely used as bulk resonators in electrical article surveillance system and studied for small-mass-detection-based portable sensing applications。 The first part of this work focuses on developing magnetoresistive and magnetostrictive sensors towards higher accuracy, higher sensitivity, and smaller physical sizes for mobile applications. Here a new methodology has been developed to guide the sensing system design. Besides, we have fabricated magnetostrictive resonators with miniaturized sizes and much larger resonant frequencies. Moreover, the resonant signals maintain good signal-to-noise ratios and quality factors. Second, a novel anisotropic magnetoresistive (AMR) angle sensor with multilayer material stack has been proposed and fabricated. Compared with traditional single layer sensors, our fabricated quadruple-layer AMR angle sensors have improved the sensing accuracy by a factor of 5. In addition, the quadruple layer AMR angle sensor demonstrates good detection accuracy even at small magnetic fields, which helps to lower the requirement of hard magnets in AMR angle sensing system Finally, the development of AMR angle sensors with stray field immunity is discussed. The signal of AMR angle sensors can be corrupted with significant errors due to the existence of stray fields in real application environments. Here we have designed a new system consisted of four AMR angle sensors along with a multipole magnet. Using the output signals from all the four sensors, the errors from stray fields are effectively reduced, which enables the implementation of AMR angle sensors in a wider range of applications
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2020; ©2020 |
| Publication date | 2020; 2020 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Deng, Yong |
|---|---|
| Degree supervisor | Wang, Shan X |
| Thesis advisor | Wang, Shan X |
| Thesis advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Suzuki, Yuri, (Applied physicist) |
| Degree committee member | Dauskardt, R. H. (Reinhold H.) |
| Degree committee member | Suzuki, Yuri, (Applied physicist) |
| Associated with | Stanford University, Department of Materials Science and Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Yong Deng |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering |
| Thesis | Thesis Ph.D. Stanford University 2020 |
| Location | electronic resource |
Access conditions
- Copyright
- © 2020 by Yong Deng
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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