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Low frequency excess noise source investigation of off-diagonal GMI-based magnetometers
| Content Provider | Hyper Articles en Ligne (HAL) |
|---|---|
| Author | Dufay, Basile Portalier, Elodie Saez, Sebastien Menard, David Dolabdjian, Christophe Seddaoui, Djamel Yelon, Arthur |
| Copyright Year | 2017 |
| Abstract | The equivalent magnetic noise spectral densities of off-diagonal GMI based magnetometers exhibit significant low frequency excess noise, proportional to 1/f noise. As it represents a serious limitation to the ultimate sensing performances of high sensitivity magnetometers, possible sources of this 1/f noise are under investigation. Low frequency magnetization fluctuations have been proposed as the noise source in the case of classical GMI-based sensors. Here, we apply this model to off-diagonal GMI-based magnetometers. This requires the inclusion of magnetization fluctuation noise sources, in addition to white noise sources from electronic conditioning in the GMI effect equations. A pessimistic scenario is presented, predicting the upper limit of low frequency excess noise from material characteristics. The equivalent magnetic noise level is then computed from the sensitivity of each term of the sensing element impedance matrix to the magnetization angle at the static working point (for both axial and circumferential static magnetic field) and to conditioning circuitry. Based on this, it appears that magnetization fluctuations similarly affect all modes of operation of the two-port network sensing element, inducing identical impedance fluctuations. It also appears that this noise depends only upon the static equilibrium condition. This condition is governed by the effective anisotropy of the magnetic wire and by both axial and circumferential static components of the working point. |
| Related Links | https://hal.science/hal-01400491/file/2016-08-18_BDufay_V2.6.pdf |
| ISSN | 00189464 |
| DOI | 10.1109/TMAG.2016.2615597 |
| Journal | IEEE Transactions on Magnetics |
| Issue Number | 1 |
| Volume Number | 53 |
| Language | English |
| Publisher | HAL CCSD Institute of Electrical and Electronics Engineers |
| Publisher Date | 2017-01-01 |
| Access Restriction | Open |
| Subject Keyword | off-diagonal GMI magnetic noise magnetometer |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
