Thickness dependence of the high-frequency magnetic permeability in amorphous Fe73.5Cu1Nb3Si13.5B9 thin films

Abstract

Field-dependent transverse permeability characterization of amorphous thin films with nominal composition Fe73.5Cu1Nb3Si13.5B9 was performed for frequencies in the range of 100kHz–1.8GHz. Dynamic and static magnetic properties were investigated in films with thickness in the range from 21to5000nm. Samples with thicknesses below 85nm exhibit a well-defined in-plane uniaxial anisotropy and uniform ferromagnetic resonance modes. Samples thicker than 85nm were found to be magnetically isotropic in the plane, with complex magnetic dynamics depicted by several ferromagnetic resonance modes detected at relatively low fields. The results are discussed in terms of the stress contribution to the magnetic anisotropy of the samples.

Quantifying magnetic anisotropy dispersion: Theoretical and experimental study of the magnetic properties of anisotropic FeCuNbSiB ferromagnetic films

“…Similar dependence of the magnetic behavior with the film thickness has been already observed and discussed in detail in Refs. [9,11,12,46,47]. Moreover, just considering the studied samples, we verify that the H K , n and ϕ values decrease with the thickness.…”

“…As a matter of fact, by comparing experimental curves, it is possible to observe that the easy magnetization axis is oriented very close to the direction defined by the magnetic field applied during deposition. A small misalignment between them is a feature associated to stress stored in the film as the ferromagnetic layer thickness increases [11], to the high positive magnetostriction of the alloy, to the rectangular shape of the substrate, as well as to a possible small deviation of the sample in the experiment during the measurement. Similar dependence of the magnetic behavior with the film thickness has been already observed and discussed in detail in Refs.…”

“…Experimentally, several results have been obtained for FeCuNbSiB magnetic ribbons, and, consequently, the knowledgement about its magnetic properties and the crystallization process are well-established [1,2,[4][5][6]. However, although some reports found in literature have addressed distinct phenomena and aspects [7][8][9][10][11][12][13][14][15][16], the complete understanding on the magnetic behavior of amorphous FeCuNbSiB ferromagnetic films is still lacking [17].…”

Magnetization dynamics in nanostructures with weak/strong anisotropy

“…6,8 Since the discovery of the effect, MI has been studied in a wide variety of systems, e. g., sheets, 9 wires, [10][11][12][13][14][15][16][17][18] ribbons, [19][20][21][22][23][24] and thin films. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] In the particular case of films, an increasing interest has been devoted to the effect in single layered, 25,26 multilayered, [27][28][29][30][31][32] and structured multilayered thin films, 30,31,[33][34][35][36][37][38][39] since ...…”

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

“…Significant efforts were applied to elucidating physics of ferromagnetic resonance measurements of thick magnetic films, notably of eddy current and exchange-conductivity contributions to the resonance frequency and linewidth in metals. [27][28][29][30][31] Subsequent studies concentrated on various magnetic thin films and multilayers, [32][33][34][35][36][37] with a focus on the spectrum of their spinwave resonances. Here, we present a theory of the highfrequency permeability resulting from such resonances in very thin films with surface pinning and its application to the issue of designing the negative effective permeability.…”