A study on the thickness dependence of static and dynamic magnetic properties of Ni81Fe19 thin films

Kern, P.R.; Silva, O.E. da; Siqueira, J.V. de; Pace, R.D. Della; Rigue, Josué Neroti; Carara, M.

doi:10.1016/j.jmmm.2016.06.061

Cited by 17 publications

(9 citation statements)

References 31 publications

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“…Similar dependence of the magnetic behavior with thickness has been already verified by several groups, considering samples with different compositions and using distinct experimental techniques [6,26,[36][37][38][39][40][46][47][48][49][50][51][52]. For our set of NiFe films, as aforementioned, the change of magnetic behavior is found to occur between 150 and 200 nm.…”

Section: Quasi-static Magnetic Characterizationsupporting

confidence: 86%

“…However, we point out that this critical thickness range is strongly dependent on the preparation conditions of the films, such as substrate, pressure and power deposition, as well as on the own composition of the alloy, since this latter affects magnetic parameters as the magnetostriction constant and magnetocrystalline anisotropy [46,52]. For these reasons, reports indicating distinct critical thickness ranges may be found in literature [26,36,40,46,47]. Anyway, the interpretation for the dependence of the magnetic behavior with the film thickness is common for all studies.…”

Section: Quasi-static Magnetic Characterizationmentioning

confidence: 87%

“…To the measurements, the calibration plane is dislocated to the beginning of the microstrip line. The real µ′ and imaginary ″ µ components of the magnetic permeability μ are determined through an analytical approach from the measurements of the reflection coefficient S11 of the microstrip line when empty, loaded with a substrate with the same dimensions of the sample, and with the own sample, following the procedure discussed in detail in [25,26]. The dispersion relation curve is obtained by considering a procedure very similar to that performed for the MI results.…”

Section: Methodsmentioning

confidence: 99%

“…contrib ution [26,[36][37][38][39][40]. The remarkable change in the shape of the magnetization curves reveals the deterioration of the soft magnetic properties observed for the thinner films.…”

Section: Quasi-static Magnetic Characterizationmentioning

confidence: 99%

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Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Silva

Corrêa

Pace

et al. 2017

J. Phys. D: Appl. Phys.

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We investigate the thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films. We go beyond quasi-static measurements and focus on the dynamic magnetic response by considering three complementary techniques: the ferromagnetic resonance, magnetoimpedance and magnetic permeability measurements. We verify remarkable modifications in the magnetic anisotropy, i.e. the well-known behavior of in-plane uniaxial magnetic anisotropy systems gives place to a complex magnetic behavior as the thickness increases, and splits the films in two groups according to the magnetic properties. We identify magnetoimpedance and magnetic permeability curves with multiple resonance peaks, as well as the evolution of the ferromagnetic resonance absorption spectra, as fingerprints of strong changes of the magnetic properties associated to the vanishing of the in-plane magnetic anisotropy and to the emergence of non-homogeneous magnetization configuration, local anisotropies and out-of-plane anisotropy contribution arisen as a consequence of the non-uniformities of the stress stored in the film as the thickness is increased and/or to the columnar growth of the film. We interpret the experimental results in terms of the structural and morphological properties, quasi-static magnetic behavior, magnetic domain structure and different mechanisms governing the magnetization dynamics at distinct frequency ranges.

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Section: Quasi-static Magnetic Characterizationsupporting

confidence: 86%

Section: Quasi-static Magnetic Characterizationmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Quasi-static Magnetic Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Silva

Corrêa

Pace

et al. 2017

J. Phys. D: Appl. Phys.

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“…The agreement is good enough for these ultrathin FeNi films, however, we note that the estimated values are somewhat smaller. It is also known that thin film permalloy samples with the thickness until 100 nm show saturation magnetization at the applied magnetic field H as ≃ 5 Oe (Kern et al 2016). Here we observe that that the magnetization loop for the 4.97 nm thick FeNi film is rather narrow (see Fig.…”

mentioning

confidence: 99%

Collective magnetic response of inhomogeneous nanoisland FeNi films around the percolation transition

et al. 2018

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By using superconducting quantum interference device (SQUID) magnetometry we investigated anisotropic high-field (H 7 T) low-temperature (10 K) magnetization response of inhomogeneous nanoisland FeNi films grown by rf sputtering deposition on Sitall (TiO2) glass substrates. In the grown FeNi films, the FeNi layer nominal thickness varied from 0.6 to 2.5 nm, across the percolation transition at the dc ≃ 1.8 nm. We discovered that, beyond conventional spin-magnetism of Fe21Ni79 permalloy, the extracted out-of-plane magnetization response of the nanoisland FeNi films is not saturated in the range of investigated magnetic fields and exhibits paramagnetic-like behavior. We found that the anomalous out-of-plane magnetization response exhibits an escalating slope with increase in the nominal film thickness from 0.6 to 1.1 nm, however, it decreases with further increase in the film thickness, and then practically vanishes on approaching the FeNi film percolation threshold. At the same time, the in-plane response demonstrates saturation behavior above 1.5-2 T, competing with anomalously large diamagnetic-like response, which becomes pronounced at high magnetic fields. It is possible that the supported-metal interaction leads to the creation of a thin charge-transfer (CT) layer and a Schottky barrier at the FeNi film/Sitall (TiO2) interface. Then, in the system with nanoscale circular domains, the observed anomalous paramagnetic-like magnetization response can be associated with a large orbital moment of the localized electrons. In addition, the inhomogeneous nanoisland FeNi films can possess spontaneous ordering of toroidal moments, which can be either of orbital or spin origin. The system with toroidal inhomogeneity can lead to anomalously strong diamagnetic-like response. The observed magnetization response is determined by the interplay between the paramagnetic-and diamagnetic-like contributions.

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Improvement of microwave permeability spectra in high stacking density FeNi nanoparticle films prepared by electric field-assisted deposition

Xia

et al. 2017

Appl. Phys. A

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A study on the thickness dependence of static and dynamic magnetic properties of Ni81Fe19 thin films

Cited by 17 publications

References 31 publications

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Collective magnetic response of inhomogeneous nanoisland FeNi films around the percolation transition

Improvement of microwave permeability spectra in high stacking density FeNi nanoparticle films prepared by electric field-assisted deposition

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