An Optimized Measurement Method for Magnetic Properties of Permalloy Sheet Under Demagnetization

Shi, Minxia; Zhang, Xu; Yang, Jianzhi; Yuan, Shuai; Wang, Ling

doi:10.1109/tim.2022.3185326

Cited by 7 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A series of hysteresis models, such as Preisach [16]and J-A(Jiles-Atherton) [6,7,17], have been developed to describe the nonlinear magnetization state of soft ferromagnetic shielding materials. Among them, the J-A hysteresis model has a clear physical meaning, which is constructed by describing the wall movement law of magnetic domains under the pinning-rolling effect, and can accurately describe the nonlinear relationship between the magnetic induction strength and the magnetic field strength [17].…”

Section: Model Derivationmentioning

confidence: 99%

“…The J-A model equation (7) with the introduction of bending stresses is derived from equations (5) and (6).…”

Section: J-a Model Considering Stressmentioning

confidence: 99%

“…However, the magnetic field is at the level of 100 s of femtotesla (fT) at the scalp [5]. To prevent the MEG signals from being masked by interfering sources, such as electrical equipment, an environment with a nearly zero magnetic field is also required [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on the magnetic shielding properties of nanocrystalline strips under bending stress

Yuan,

Xu,

Wang

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

The study of the magnetic properties of nanocrystalline materials under stress is of great significance for the construction of small and lightweight magnetic shielding rooms. Therefore, this paper investigates the effect of stress on the magnetic properties of nanocrystalline materials under the action of external bending stress. By comparing the test results of the soft magnetic measuring device with and without bending stress, it is found that the magnetic permeability (μi) decreases by about 51.41% when the introduced bending stress σ is increased by about 5.96"×" 107 pa, whereas the "K" _"u" ^"Fe-Si" (induced magnetic anisotropy constant) and "H" _"k" (field of magnetic anisotropy) increase by 5.30"×" 102 J/m3and 1.08"×" 102 A/m, respectively. The Jiles-Atherton (J-A) model considering the bending stress and radius of change correlation is established, and the typical parameters of the J-A model are fitted using the Gazelle Optimization Algorithm (GOA), and the RMSE (root mean square error) of all of them are less than 0.056 T. The magnetic domain density increased with the increase of bending stress, which verified the correlation between the J-A model parameters and the bending stress. Our results reveal that the nanocrystalline macroscopic and micromechanical magnetic properties can be effectively combined with the J-A model, which will provide a theoretical basis for the simulation study of the nanocrystalline magnetic shielding device in the actual stress situation.

show abstract

Section: Model Derivationmentioning

confidence: 99%

“…The J-A model equation (7) with the introduction of bending stresses is derived from equations (5) and (6).…”

Section: J-a Model Considering Stressmentioning

confidence: 99%

See 1 more Smart Citation

Study on the magnetic shielding properties of nanocrystalline strips under bending stress

Yuan,

Xu,

Wang

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…However, the effective signal of the H coil decays as the excitation frequency falls and is hard to be precisely detected under a lower frequency magnetic field. Therefore, previous studies focussed on the conventional magnetic characteristics of sinusoidal excitation in power frequency [32]. The hysteresis behavior of permalloy sheets, which would show distinct trends in terms of MSR operating environment in low-frequency field and demagnetization, is rarely tested or analyzed.…”

Section: Introductionmentioning

confidence: 99%

The SF and remanence evaluation of magnetic shields based on SST for low-frequency and degaussing situation

Shi,

Zhang,

Yang

et al. 2024

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

The permalloy sheet, as the dominant shielding functional material, mainly determines static and low frequency shielding performance of magnetically shielded room (MSR). However, lack of measurement of shielding sheet in practical use would lead to the nonnegligible evaluation error for MSR performance. Therefore, an estimation technique of shielding factor (SF) and the remanence of MSR is proposed in this paper with the consideration of the nonlinear magnetic characteristics of the permalloy sheet tested by single sheet tester for low frequency field and degaussing situation(L-D-SST). First, a high-accuracy measurement system, composed of L-D-SST (for exciting magnetic field and sensing the corresponding B and H) and the control system (for applying excitation to L-D-SST and amplifying, filtering and collecting B and H signal), is established. The weak magnetic fields of low frequencies and decaying alternating demagnetizing field excitations are separately applied to L-D-SST for basic magnetization curves (BM curves) and anhysteretic magnetization curve (AM curve) test. Furthermore, the BM and AM curves are respectively integrated with FEM algorithm for the accurate and reliable estimation of the SF and remanence of MSR in operation state. In addition, the tested magnetic properties are applied to the optimization of MSR shielding quality.

show abstract

“…Magnetic shielding device is usually constructed by the high-permeability materials based on the effect of flux shunting [14], and high-conductivity materials based on the effect of eddy current [15]. Among them, the property of the high-permeability materials (a kind of soft magnetic material) always determines the performance of the magnetic shielding device in most applications [16,17]. In order to achieve a better magnetic shielding performance, it is important to obtain the complete property of the high-permeability material before the construction of the magnetic shielding device.…”

Section: Introductionmentioning

confidence: 99%

Test and Analysis of High-Permeability Material’s Microstructure in Magnetic Shielding Device

et al. 2023

View full text Add to dashboard Cite

The magnetic shielding device is used to provide an extreme weak magnetic field, which plays a key role in variety of fields. Since the high-permeability material constituting the magnetic shielding device determines the magnetic shielding performance, it is important to evaluate the property of the high-permeability material. In this paper, the relationship between the microstructure and the magnetic properties of the high-permeability material is analyzed using minimum free energy principle based on magnetic domain theory, and the test method of the material’s microstructure including the material composition, the texture and the grain structure to reflect the magnetic properties is put forward. The test result shows that the grain structure is closely related to the initial permeability and the coercivity, which is highly consistent with the theory. As a result, it provides a more efficient way to evaluate the property of the high-permeability material. The test method proposed in the paper has important significance in the high efficiency sampling inspection of the high-permeability material.

show abstract

An Optimized Measurement Method for Magnetic Properties of Permalloy Sheet Under Demagnetization

Cited by 7 publications

References 31 publications

Study on the magnetic shielding properties of nanocrystalline strips under bending stress

Study on the magnetic shielding properties of nanocrystalline strips under bending stress

The SF and remanence evaluation of magnetic shields based on SST for low-frequency and degaussing situation

Test and Analysis of High-Permeability Material’s Microstructure in Magnetic Shielding Device

Contact Info

Product

Resources

About