Influence of a helical anisotropy profile on the static and dynamic properties of a soft magnetic layer

Gloanec, M.; Dubourg, S.; Acher, O.; Duverger, F.; Plessis, D.; Bonneau-Brault, A.

doi:10.1103/physrevb.85.094433

Cited by 11 publications

(6 citation statements)

References 34 publications

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“…Soft ferromagnetic films are used in various types of magnetoelectronic devices [ 1 ]. One of the ways to increase the magnetic softness of thin films is to create the layers with helical magnetic anisotropy [ 2 ]. The helical variation in the orientation of the easy magnetization axis can be obtained by the deposition of the films in the magnetic field rotating in the plane of the substrate [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…One of the ways to increase the magnetic softness of thin films is to create the layers with helical magnetic anisotropy [ 2 ]. The helical variation in the orientation of the easy magnetization axis can be obtained by the deposition of the films in the magnetic field rotating in the plane of the substrate [ 2 , 3 ]. A stable helical profile may occur for a film thickness greater than the specific value, defined as 2π(A/K) 1/2 , where K is the anisotropy constant, and A is the exchange stiffness constant.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Svalov

Gorkovenko

Larrañaga

et al. 2022

Sensors

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FeNi films of different thickness and FeNi/(Fe, Co)/FeNi trilayers were prepared by magnetron sputtering deposition onto glass substrates. The permalloy films had a columnar microstructure. The detailed analysis of the magnetic properties based on the magnetic and magneto-optical measurements showed that at thicknesses exceeding a certain critical thickness, hysteresis loops acquire a specific shape and the coercive force of the films increase sharply. The possibility of the estimation of the perpendicular magnetic anisotropy constant using the Murayama equation for the thickness dependence of saturation field was demonstrated. The results of studies of the structural and magnetic properties of FeNi films laminated by Fe and Co spacers with different thickness are presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Svalov

Gorkovenko

Larrañaga

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…3. [35][36][37][38] A driver coil (Drive Coil) was used to induce microwave excitation, the induction coil is a ring coil enclosed by a ribbon transmission line. Meanwhile, the induction coil (Pickup Coil) was used to detect voltage signal produced by electromagnetic induction.…”

Section: Coaxial-line Methodsmentioning

confidence: 99%

“…[41][42][43][44] The transmission line method is the most widely used method at present. [37,38] Combining with traditional testing methods, our group proposed a soft magnetic thin film magnetic spectrum testing method without calibration based on electromagnetic induction principle. [11,12] 4.1.…”

Section: Traditional Shorted Circuit Microstrip Test Methodsmentioning

confidence: 99%

Techniques of microwave permeability characterization for thin films*

Li¹,

Wang²,

Chai³

2019

Chinese Phys. B

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We review the microwave methods to characterize the material properties, including the established and the emerging techniques in material characterization, especially the permeability spectra of the magnetic thin films. Almost all aspects of the microwave techniques for characterizing the permeability of thin films at microwave frequencies, including the new methods developed by our group, are presented. Firstly, the introduction part is presented. Secondly, the coaxial-line with transmission/reflection methods and the pickup coil with electromagnetic induction method are presented. Thirdly, the most widely used shorted microstrip technique is discussed in detail by the equivalent circuit method, transmission line method, and electromagnetic induction method. Fourthly, the coplanar waveguide method and the near-field probe method are also introduced. Finally, the high temperature permeability characterization by using the shorted microstrip line, the near-field microwave probe, and the shorted microstrip line probe are described in detail. This paper may be useful for researchers or engineers who will build up such measurement fixture to make full use of the existing methods or to develop original methods to meet the requirements for ever-rising measurements.

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“…A generalized analysis method to characterize this dispersion is shown. It is based on the angular evaluation of the integral criterion [6]. In contrast to the method recently proposed by Dubuget et al [4], the analysis here is based on the whole permeability spectra and no particular law of magnetization dispersion is required.…”

Section: Introductionmentioning

confidence: 99%

Magnetic dispersion in a soft amorphous layer with a helical anisotropy profile

Gloanec

Dubourg

Acher

et al. 2013

EPJ Web of Conferences

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Abstract.A new analysis method of the magnetization dispersion in a thin magnetic film is presented. It is based on the angular measurement of the permeability spectra and on the evaluation of the integral relation. It provides the average orientation of the magnetization in the layer and a dispersion parameter which quantifies the magnetic dispersion. The method is successfully applied on a soft CoNbZr 800nm magnetic layer which possesses a helical anisotropy profile. This helical profile is obtained by rotating continuously the sample during the sputtering deposition on a scale from R = 0 to 16 turns. The study reveals that, for about 1/2 turn, a maximal dispersion is achieved and, for more elevated rotation speed, the magnetization no longer follows the anisotropy profile but lines up along an easiest axis direction. The experimental data are well described by a one-dimensional micromagnetic model which takes both exchange coupling and a helical anisotropy into account. The analytical cases with an exchange constant null and infinite are also considered in order to gain more insight onto the observed magnetic behaviour in the soft magnetic thin film.

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Influence of a helical anisotropy profile on the static and dynamic properties of a soft magnetic layer

Cited by 11 publications

References 34 publications

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Techniques of microwave permeability characterization for thin films*

Magnetic dispersion in a soft amorphous layer with a helical anisotropy profile

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