Improved magnetic anisotropy and magnetostriction by laminating FeAl(N) with Permalloy to multilayers

Maaß, W.; Rohrmann, H.

doi:10.1109/20.706574

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…In particular, when fitting the initial permeability it is observed that FeAlN exhibit a larger influence from LL and structural damping. 2 In this work a more simplified method was used comparing the two most significant parameters of the phenomenological damping: ͑a͒ Difference due to eddy current and structural effects. Comparing quasistatic and ( f ) at frequencies at 10-300 MHz ͑b͒ LL damping: comparing the resonance frequency f r taken from the maximum of the imaginary part of and the value of the effective cutoff frequency f cf where has dropped to 1/e of its value at low frequency.…”

Section: Introductionmentioning

confidence: 99%

High frequency performance of laminated soft magnetic films (NiFe, FeAlN, and amorphous CoFeBSi) in external fields

Rieger

Rupp

Gieres

et al. 2002

Journal of Applied Physics

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Magnetization reversal and magnetoresistance behavior of perpendicularly magnetized [Co/Pd]4/Au/[Co/Pd]2 nanowires J. Appl. Phys. 112, 073902 (2012) Electric-field control of CoFeB/IrMn exchange bias system J. Appl. Phys. 112, 064120 (2012) Critical effect of spin-dependent transport in a tunnel barrier on enhanced Hanle-type signals observed in threeterminal geometry Appl. Phys. Lett. 101, 132411 (2012) Giant tunneling magnetoresistance in epitaxial Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions by halfmetallicity of Co2MnSi and coherent tunneling Appl. Phys. Lett. 101, 132418 (2012) Interface mediated ferromagnetism in bulk CuO/Cu2O composites Appl.Thin film multilayers of different compositions ͑NiFe, FeAlN, and amorphous CoFeSiB͒ were prepared by sputter deposition. The ultrahigh frequency performance was studied using rf fields perpendicular to the in-plane easy axis. By applying external bias fields either along or perpendicular to the easy axis ͑perpendicular to the rf field excitation͒, the cutoff frequency of the different alloys can be shifted significantly to higher frequencies ͑Ͼ1 GHz͒ according to theory. On the other hand, it is possible from these measurements to identify different phenomenological damping of the material systems due to structural effects. Although FeAlN exhibits the highest saturation magnetization compared to NiFe and CoFeBSi, it shows a higher damping which is explained by nonideal structure.

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Section: Introductionmentioning

confidence: 99%

High frequency performance of laminated soft magnetic films (NiFe, FeAlN, and amorphous CoFeBSi) in external fields

Rieger

Rupp

Gieres

et al. 2002

Journal of Applied Physics

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“…For practical applications, a magnetic thin film should have a thickness of at least hundreds of nanometres. But good soft magnetic properties are often experimentally obtained at a limited film thickness (usually smaller than 100 nm) [4][5][6]. This is because the thickness changes the microstructures and/or film stress, which would have a great influence on the soft magnetism [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Soft magnetic properties and high frequency permeability in [CoAlO/oxide] multilayer films

Ma¹,

Ong²

2007

J. Phys. D: Appl. Phys.

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A CoAlO thin film was found to have good soft magnetic properties and gigahertz frequency response when it had a thickness of tens of nanometres. Increasing the thickness by more than 100 nm rapidly increased the coercivity and seriously degraded the high frequency response. A multilayering technique (laminating the magnetic layer with oxide spacers) was exploited to improve the magnetic properties in thick films. AlOx and SiOx were used as the oxide spacing layers in this experiment. For the 105 nm CoAlO films, the easy and hard axis coercivities were reduced by more than 8 times by introducing 2 nm AlOx or 5 nm SiOx spacers. With our optimum lamination [CoAlO (52.5 nm)/AlOx (2 nm)]7, good soft magnetic properties (easy and hard axis coercivities: 21 and 14 Oe and effective anisotropy field: 54 Oe) and high frequency response (real permeability: >200 up to ∼2 GHz) were successfully obtained in a multilayer film at a thickness of 380 nm. The changes in the microstructures and film stress with the introduction of the oxide spacers are discussed in this paper.

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“…Recent major efforts in developing such head materials have been focused on FeN-based nanocrystalline soft magnetic films, such as FeTiN, FeTaN, and FeAlN, which exhibit a saturation magnetic flux density B s of up to 20 kG and coercivity of 1-7 Oe. [1][2][3][4][5][6] However, the major drawback of the FeNbased material is that the maximum obtainable B s of the material is smaller than pure Fe (B s ϭ21.5 kG). Although the giant magnetic moment Fe-N films with B s up to 29 kG ͑containing ␣Љ-Fe 16 N 16 martensite phase͒ have been reported, [8][9][10][11] the possibility of using such a material in thinfilm heads is still remote because of the poor thermal stability, the lack of uniaxial anisotropy, and the poor reproducibility of the ␣Љ-Fe 16 N 16 martensite phase.…”

Section: Introductionmentioning

confidence: 99%

( FeCo/Co–M ) n soft magnetic multilayers with uniaxial anisotropy and very high saturation magnetization

Pan

2003

Journal of Applied Physics

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Nanocrystalline (FeCo/CoNbZr)n and (FeCo/CoZr)n uniaxial-anisotropy soft magnetic multilayers with saturation flux density up to 22.5 kG were prepared by rf sputtering. Magnetic and microstructural properties of these films were studied before and after magnetic annealing. Cross-sectional transmission electron microscopy study showed that the soft magnetic Co–M (M=Zr, Nb, etc.) amorphous layers act as grain refiners as well as soft magnetic grain-boundary materials for the FeCo layers. The resultant multilayer films exhibit excellent uniaxial-anisotropy soft magnetic properties with small coercivity, high anisotropy field Hk, and excellent thermal stability after magnetic field annealing, which are very attractive for applications in thin-film heads for ultrahigh-density magnetic recording. The origin of the soft magnetism was discussed in the light of the random anisotropy model. The improvement of soft magnetic properties of the laminated films is closely associated with the reduction in grain size of the FeCo layers due to lamination. Qualitative agreement between the experimental data and theoretical calculations can be established. Magnetic field annealing was very effective in improving the soft magnetic properties of the films. However, further study is required in order to understand the mechanism. The saturation magnetization of the film follows a simple summation function of the saturation magnetization of the two sublayer materials, with a maximum achievable value of 22.5 kG within the uniaxial-anisotropy regime.

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Improved magnetic anisotropy and magnetostriction by laminating FeAl(N) with Permalloy to multilayers

Cited by 8 publications

References 5 publications

High frequency performance of laminated soft magnetic films (NiFe, FeAlN, and amorphous CoFeBSi) in external fields

High frequency performance of laminated soft magnetic films (NiFe, FeAlN, and amorphous CoFeBSi) in external fields

Soft magnetic properties and high frequency permeability in [CoAlO/oxide] multilayer films

( FeCo/Co–M ) n soft magnetic multilayers with uniaxial anisotropy and very high saturation magnetization

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