Structural and magnetic properties of multilayers

Lidbaum, Hans; Raanaei, Hossein; Papaioannou, Evangelos Th.; Leifer, Klaus; Hjörvarsson, Bjørgvin

doi:10.1016/j.jcrysgro.2009.11.025

Cited by 12 publications

(3 citation statements)

References 24 publications

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“…A similar behavior has previously been reported for a multilayer of Co 68 Fe 24 Zr 8 /Al 2 O 3 . 46 However, in that case, the superparamagnetic behavior could be assigned to the formation of clusters resulting from a collapse of the continuity of the magnetic layers at a thickness of about 10 Å. In the present case, the 5 Å Fe 90 Zr 10 layers are continuous and do not break down into small structural regions, as confirmed by the X-ray reflectivity measurements (see Fig.…”

Section: B Magnetic Propertiessupporting

confidence: 68%

Finite-size effects in amorphous Fe90Zr10/Al75Zr25 multilayers

Korelis,

Jönsson,

Liebig

et al. 2012

Preprint

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The thickness dependence of the magnetic properties of amorphous Fe90Zr10 layers has been explored using Fe90Zr10/Al75Zr25 multilayers. The Al75Zr25 layer thickness is kept at 40 Å, while the thickness of the Fe90Zr10 layers is varied between 5 and 20 Å. The thickness of the Al75Zr25 layers is sufficiently large to suppress any significant interlayer coupling. Both the Curie temperature and the spontaneous magnetization decrease non-linearly with decreasing thickness of the Fe90Zr10 layers. No ferromagnetic order is observed in the multilayer with 5 Å Fe90Zr10 layers. The variation of the Curie temperature Tc with the Fe90Zr10 layer thickness t is fitted with a finite-size scaling formula [1 − Tc(t)/Tc(∞)] = [(t − t ′ )/t0] −λ , yielding λ = 1.2, and a critical thickness t ′ = 6.5 Å, below which the Curie temperature is zero.

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Section: B Magnetic Propertiessupporting

confidence: 68%

Finite-size effects in amorphous Fe90Zr10/Al75Zr25 multilayers

Korelis,

Jönsson,

Liebig

et al. 2012

Preprint

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“…Surprisingly, the HRTEM shows a polycrystalline structure of the CoFeZr layer for all the other thickness 5 to 20 nm. Indeed it demonstrates that UMA and magnetic softness (low coercivity) may be induced in polycristalline CoFeZr alloys, generally considered proper to amorphous alloys in such composition [7,20].…”

mentioning

confidence: 94%

Driving mechanism for damping and g-factor in non-amorphous ferromagnetic CoFeZr ultrathin films

Graët¹,

Spenato²,

Beaulieu³

et al. 2016

EPL

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We demonstrate that an in-plane uniaxial anisotropy may be induced in nonamorphous soft CoFeZr films. We used broadband ferromagnetic resonance spectroscopy and complex permeability spectra to investigate the spin dynamics in CoFeZr films. We report a systematic study of the FM thickness on the fundamental dynamic parameters such as the effective magnetisation, the g-factor and relaxation mechanisms. Our study reveals that the decrease of the effective magnetisation mesured with FMR with thickness is not due to perpendicular anisotropy but to low dimentionality. Moreover, we observed a decrease of the g-factor with thickness and a modification of the ratio of the orbital to the spin magnetic moment. These films exhibit good high-frequency performance red (i.e. high permeability in a broad frequency range and a low damping) at low thickness of about a few nanometers.

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“…Amorphous alloys are attracting increasing interest due to their magnetic [1][2][3][4][5], mechanical [6,7] and corrosion resistive [6,8] properties. A number of studies have highlighted their potential application as protective coatings as well as in layered structures of technological importance such as magnetic tunnel junctions [2,3].…”

Section: Introductionmentioning

confidence: 99%

Atomic and electronic structure of amorphous Al–Zr alloy films

Vegelius¹,

Soroka²,

Korelis³

et al. 2011

J. Phys.: Condens. Matter

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Amorphous Al(73)Zr(27) alloy film, grown and then subjected to heat treatments at 400 and 700 °C, was studied using a combination of x-ray diffraction and soft x-ray spectroscopic techniques. The Al L(2,3) and Al K x-ray absorption spectroscopy (XAS) and Al L(2,3) x-ray emission spectroscopy (XES) used allowed probing the unoccupied and occupied Al 3s, d states and unoccupied Al 3p states in the sample studied. An irreversible transition from amorphous alloy to a mixture of polycrystalline alloy and amorphous alloy, and then to an amorphous oxide phase was observed. After the annealing at 400 °C the Al L(2,3) spectra obtained by XAS could be explained as sums of spectra from amorphous Al(73)Zr(27) alloy and (poly)crystalline Al. This indicates that the sample consists of a mixture of Al-rich crystalline and Zr-enhanced amorphous alloys, as compared to the stoichiometry of the as-deposited Al(73)Zr(27) sample, and that the electronic wavefunctions in the crystalline and amorphous regions can be considered to be confined within the respective regions. The relative amounts of Al atoms were found to be around 1:3 in the crystalline and amorphous phases, respectively, as deduced from the analysis of changes in the electronic structure using Al L(2,3) XAS data. The interpretation was confirmed by the Al K XAS and Al L(2,3) XES. Upon further annealing at 700 °C the polycrystalline phase transformed into amorphous oxide, while the amorphous alloy phase underwent gradual oxidation. The important finding was that the greater part of the sample remained in the amorphous state throughout the temperature regimes described.

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Structural and magnetic properties of multilayers

Cited by 12 publications

References 24 publications

Finite-size effects in amorphous Fe90Zr10/Al75Zr25 multilayers

Finite-size effects in amorphous Fe90Zr10/Al75Zr25 multilayers

Driving mechanism for damping and g-factor in non-amorphous ferromagnetic CoFeZr ultrathin films

Atomic and electronic structure of amorphous Al–Zr alloy films

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