Advanced Magnetic Microwires

Vázquez, M.

doi:10.1002/9780470022184.hmm418

Cited by 82 publications

(55 citation statements)

References 159 publications

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“…To demonstrate this, GMI has been measured in magnetically soft glass coated microwires which are known to exhibit quite outstanding magnetic properties, including GMI. 17 The magnetoimpedance was investigated in the frequency range of 10 MHz-3.5 GHz in a glass-covered microwire prepared by the Taylor-Ulitovsky method. 18 The nominal composition of the microwire alloy was Co 67 Fe 4 Cr 7 Si 8 B 14 known to exhibit nonmagnetostrictive character, determining its GMI.…”

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confidence: 99%

Nonlinear magnetoimpedance and parametric excitation of standing spin waves in a glass-covered microwire

et al. 2009

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The giant magnetoimpedance of an 8.5 m glass-covered amorphous microwire was investigated in the frequency range of 10 MHz-3.5 GHz. It was found that when the exciting microwave current exceeds some threshold value, a periodic fine structure appears in the frequency dependence of the complex impedance. The appearance of this nonlinear phenomenon is interpreted to be a consequence of the parametric excitation of standing spin waves. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3079659͔ Nonlinear magnetization dynamics, which is one of the fundamental issues in applied magnetism, has recently received increasing attention in connection with the advances in magnetic storage technologies and spintronics. 1 Materials and devices used in these areas typically have nanoscale dimensions and operate in the gigahertz range. The understanding of magnetization dynamics is of great importance for these technologies. The nonlinear behavior of ferrites and garnets was systematically investigated during the 1950s and 1960s, particularly in connection with the development of radar and microwave techniques. With increasing interest in metallic ferromagnets, nowadays, new experimental methods are desirable for investigation of the nonlinear magnetic phenomena in these materials. One such technique is the giant magnetoimpedance ͑GMI͒.GMI comes from the dependence of electromagnetic skin depth in soft magnetic metals on the external dc magnetic field. 2 It has been shown by Yelon et al. 3 that the theoretical description of GMI, which is based on the simultaneous solution of Maxwell equations and the LandauLifshitz ͑LL͒ equation of motion is similar to the theory of ferromagnetic resonance ͑FMR͒ in metals. The LL is generally a nonlinear equation. In the small signal limit ͑low ac excitation current͒, where the LL equation can be linearized, this theoretical approach provides a very good explanation for the observed GMI behavior. 4 Nevertheless, at high excitation current, where the nonlinearity of LL equation must be taken into account, nonlinear effects should appear. Considering the correspondence between GMI and FMR one can expect that various nonlinear effects, similar to those observed in FMR, 5 also take place in the GMI. Because of the large damping of magnetization motion, the standard nonlinear FMR experiments in ferromagnetic metals require high power microwave sources. 6 In GMI measurements, however, the conditions for nonlinear behavior can already be achieved with exciting currents of a few milliampere. 7 Among various nonlinear phenomena, "frequency multiplication" ͑higher order harmonics of GMI signal͒ has already been investigated. [8][9][10][11][12][13][14][15] Although the similarity between the experimental configurations for transverse GMI in metallic ribbons and parallel pumping experiments in ferromagnetic insulators has already been pointed out by Yelon et al., 7 the parametric excitation of spin waves, 16 and other known nonlinear phenomena have not been reported so far.The aim of this paper is to ...

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confidence: 99%

Nonlinear magnetoimpedance and parametric excitation of standing spin waves in a glass-covered microwire

et al. 2009

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“…The single domain wall magnetization reversal process which is typical for this group of magnetic materials makes these materials also very suitable for the study of a single domain wall processes as well as domain wall structure. The dynamics of a single domain wall in so-called bistable microwire has been the subject of many studies [3]. However, many questions about the structure and dimension of this type of domain wall still remain open.…”

Section: Introductionmentioning

confidence: 99%

Study of Axial Dimension of Static Head-to-Head Domain Boundary in Amorphous Glass-Coated Microwire

et al. 2017

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A new experiment allowing the study of static domain boundary dimensions in bistable microwire is proposed. In this experiment a static domain boundary is created by an inhomogeneous axial magnetic field. The changes in axial magnetic flux due to the presence of this boundary were measured along the microwire using two pick-up coils. Experimental results were compared with a simple theoretical model. For Fe77.5Si7.5B15 microwire with total diameter of 30 µm and metal nucleus diameter of 15 µm, good agreement between theoretical and experimental data was obtained for an axial dimension of the static domain boundary about 200 times larger than the diameter of the wire metallic core.

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“…Amorphous magnetic glass-coated microwires are novel materials with outstanding magnetic behavior for micromagnetism studies with high potential for technological applications [1,2,3]. They consist of a magnetic nucleus (which diameter ranges between 1 and 30 µm) coated by a Pyrex-like glass (2 to 20 µm thick), and they are prepared by quenching and drawing technique.…”

Section: Introductionmentioning

confidence: 99%

Bistable FeCoMoB microwires with nanocrystalline microstructure and increased Curie temperature

Klein¹,

Varga²,

Vojtaník³

et al. 2010

J. Phys. D: Appl. Phys.

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To cite this version:P Klein, R Varga, P Vojtanik, J Kovac, J Ziman, et al. They combine advantages of nanocrystalline alloys exhibiting simultaneously increased Curie temperature and magnetic bistability, which is required for modern sensoric and spintronic devices. Positive magnetostriction of the crystalline FeCo grains results in a magnetic bistability, whereas good soft magnetic properties remains stabilized. As a result of mechanical stress induced by the glass-coating, the optimum temperature range for thermal treatment is enhanced up to 600 o C.

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Advanced Magnetic Microwires

Cited by 82 publications

References 159 publications

Nonlinear magnetoimpedance and parametric excitation of standing spin waves in a glass-covered microwire

Nonlinear magnetoimpedance and parametric excitation of standing spin waves in a glass-covered microwire

Study of Axial Dimension of Static Head-to-Head Domain Boundary in Amorphous Glass-Coated Microwire

Bistable FeCoMoB microwires with nanocrystalline microstructure and increased Curie temperature

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