Cylindrical magnetization model for glass-coated microwires with circumferential anisotropy: Dynamics

Torrejón, Jacob; Thiaville, A.; Adenot-Engelvin, Anne-Lise; Vázquez, M.

doi:10.1016/j.jmmm.2012.12.051

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…This loop is typical of a microwire with relatively small and negative magnetostriction: this is nearly non-hysteretic and exhibits a welldefined transverse (circular) magnetic anisotropy with anisotropy field of around 7 Oe. Its domain structure is characterized by a main circumferential domain but containing an inner axial vortex structure [31]. Figure 7.4b depicts the loop for the CoNi hard magnetic shell (it was prepared for the experiment on a Pyrex capillary with similar diameter as in the sample of Fig.…”

Section: Room Temperature Hysteresis Loopsmentioning

confidence: 99%

Bimagnetic Microwires, Magnetic Properties, and High-Frequency Behavior

Vázquez

Kammouni

Kurlyandskaya

et al. 2016

Novel Functional Magnetic Materials

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Amorphous magnetic metals are being investigated because of their outstanding magnetic behavior that makes them especially suitable as sensing elements in various devices [1]. Their particular magnetic behavior is a consequence of the intrinsic atomic disordering that in addition results in very interesting fundamental phenomena. Glassy metals are prepared by rapid solidification techniques that enable their preparation in planar (ribbons or thin films [2]) or cylindrical (wires) shapes [3]. Alternatively, amorphous alloys with interesting magnetic behavior can be also obtained as bulk material or can give rise to ultrasoft magnetic alloys after

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Section: Room Temperature Hysteresis Loopsmentioning

confidence: 99%

Bimagnetic Microwires, Magnetic Properties, and High-Frequency Behavior

Vázquez

Kammouni

Kurlyandskaya

et al. 2016

Novel Functional Magnetic Materials

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“…Equation (2) has been proposed for thin ferromagnetic films in [3] and, independently, for platelet inclusions in composites in [4]. It is also known that this equation governs hexagonal ferrites, which are the magnetic materials with the pronounced crystallographic magnetic anisotropy [5], as well as magnetic microwires with circumferential magnetization [6]. These magnets are considered as advantageous from the viewpoint of developing of materials with high microwave permeability.…”

Section: Introductionmentioning

confidence: 99%

“…The exact value in this factor may vary due to a distribution of magnetic moments in the material [8], demagnetization and the presence of domain structure in thin films [9], [10], the presence of out-of-plane anisotropy field in hexagonal ferrites [5], or non-uniform magnetization in magnetic microwires [6]. However, the quadratic dependence on the saturation magnetization of the material, which provides large permeability at high frequencies, is kept all these cases.…”

Section: Introductionmentioning

confidence: 99%

Limitations on high-frequency permeability of magnetic materials

Rozanov¹,

Koledintseva

2013

2013 IEEE International Symposium on Electromagnetic Compatibility

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Engineering of magnetic composites with high microwave permeability is important for EMC/EMI and other applications. One of the challenging problems is to determine constraints on the achievable high-frequency permeability of magnetic composites. The objective of the present paper is to analyze the data available from the literature on the microwave permeability constraints and derive a generalized constraint condition. It is well known that in many practical occasions the actual magnetic frequency dispersion curves differ from the Lorentzian behavior. For these cases, an integral form of the constraint may be useful. Possible applications of the integral constraint are discussed for the cases of large damping, pronounced effect of eddy currents, and inhomogeneous materials. It is shown that the derived constraint can be successfully used in these cases for both estimating microwave performance of devices containing magnetic materials and obtaining additional data on the magnetic structure of materials.

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“…16 The magnetic behavior of these circularly magnetized wires is relevant for the development of sensor technologies, as well as in applications requiring high controllable magnetic permeability. Particularly, the circular anisotropy field can be tailored simply by tuning the alloy composition as well as by suitable thermal treatments.…”

mentioning

confidence: 99%

“…The observed relatively modest irreversibility's of LMOKE and TMOKE curves should be ascribed to the presence of a vortex structure in the core of the microwire. 16 At the vortex core, that is the wire axis, magnetization is axially oriented. As the distance from the wire axis increases, it rotates towards a circumferential orientation.…”

mentioning

confidence: 99%