Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Silva, R.B. da; Silva, E.F.; Mori, T. J. A.; Pace, R.D. Della; Dutra, R.; Corrêa, M.A.; Bohn, F.; Sommer, R.L.

doi:10.1016/j.jmmm.2015.06.038

Cited by 20 publications

(7 citation statements)

References 19 publications

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“…This type of the AMI has been observed initially in field-annealed amorphous ribbons [6,7]. For film structures, the AMI has been studied extensively in the exchange bias multilayers [8,9]. It was found that the linear behavior of the MI response can be tuned by modifying the angle between the external field and exchange bias field or by changing the frequency.…”

Section: Introductionmentioning

confidence: 87%

Asymmetric Magnetoimpedance in Bimagnetic Multilayered Film Structures

Антонов

Buznikov

2017

Proceedings of the Scientific-Practical Conference "Research and Development - 2016"

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The magnetoimpedance (MI) effect in bimagnetic multilayered film is studied theoretically. The multilayer consists of a repetition of the base three-layered film structure having the soft and hard magnetic layers separated by highly conductive non-magnetic spacer. It is shown that the magnetostatic coupling changes the magnetization distribution in the soft magnetic layers and leads to the asymmetry in the field dependence of the impedance. The influence of the number of layers on the asymmetric magnetoimpedance (AMI) is analyzed. The calculated field and frequency dependences of the impedance describe qualitatively the AMI effect observed in bimagnetic multilayers. The results obtained may be used in the development of sensors of the magnetic field.

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Section: Introductionmentioning

confidence: 87%

Asymmetric Magnetoimpedance in Bimagnetic Multilayered Film Structures

Антонов

Buznikov

2017

Proceedings of the Scientific-Practical Conference "Research and Development - 2016"

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“…single domain) and thus the EB is solely determined by the AF spin structure. Subsequently, this thickness dependence has been experimentally confirmed in many systems [22,23]. However, when considering incomplete domain walls in the FM layer Mejia-Lopez et al [24] analytically predicted a crossover from…”

Section: Introductionmentioning

confidence: 89%

Role of ferromagnetic spin structure in magnetization reversal and exchange bias phenomena

Hu¹,

Li²,

Chi³

et al. 2018

J. Phys. D: Appl. Phys.

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Recently, the dependence of exchange bias (EB) on ferromagnetic layer thickness (t FM ) and temperature has become a matter of controversy, triggering renewed research efforts to decipher the key aspects of these intriguing phenomena. To demonstrate these anomalous dependences linked to the ferromagnetic spin structures, a modified Monte Carlo method is used on models of NiFe/antiferromagnet and Fe/antiferromagnet bilayers where a twisted configuration is favored along the film depth in the ferromagnetic layer during magnetization reversals. It is found that the EB field deviates from the reciprocal relation with t FM towards a lower value as t FM increases, and the maximum value of the EB field with temperature appears at 97 K for NiFe and 123 K for Fe, not the lowest temperature. The decrease in the EB field with t FM may also depend on the thickness of the antiferromagnetic layer and the twisted angle. The twisted configuration formed in a thick ferromagnetic layer encourages the propagation of domain walls through the ferromagnetic film to decrease the external switching field, leading to a suppressed EB. On the other hand, this twisted configuration simultaneously widens the domain walls and removes the unstable pinning points at relatively high temperatures. As a result, EB is recovered.

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“…Subsequently, GMI effect has also been found in amorphous ribbons [74,75] and multilayer films. [76,77] The origin of the GMI effect is normally explained by the skin effect of the conductor under high frequency. In ferromagnetic amorphous micro-fibers, domain wall movement is affected by the external magnetic field, and the skin depth is dependent on the circumferential permeability, which changes as the circular domain wall moves.…”

Section: Gmi Effect Of Multi-component Amorphous Microfibersmentioning

confidence: 99%

Amorphous phase formation rules in high-entropy alloys

Xing

Zhang

2017

Chinese Phys. B

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There have been many interesting studies on high-entropy alloys (HEAs), also known as multi-component (MC) alloys (MCAs), in recent years. MC metallic-glasses (MGs) have shown the potential to express the advantages of MCAs and MGs in tandem. Amorphous phase formation rules are a crucial issue in the HEA and MCA field. For equal or near-equal atomic ratio alloys, mixed-entropy among the elements has a significant effect on the phase formation. This paper focuses on HEA amorphous phase formation rules. In the first two sections, the recent progress in amorphous phase formation in HEAs and MCAs is reviewed, including the effective factors and correlative parameters related to amorphous phase formation. In the third section, novel MCMGs including high-entropy (HE) bulk-metallic-glass (HE-BMG) and MCMG films developed in recent decades are summarized, and the giant-magnetic-impedance (GMI) effect of MC amorphous fibers is discussed.

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Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Cited by 20 publications

References 19 publications

Asymmetric Magnetoimpedance in Bimagnetic Multilayered Film Structures

Asymmetric Magnetoimpedance in Bimagnetic Multilayered Film Structures

Role of ferromagnetic spin structure in magnetization reversal and exchange bias phenomena

Amorphous phase formation rules in high-entropy alloys

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