Magnetic properties of Ni/Pt multilayers

Benkirane, Karim; Elkabil, R.; Lassri, M.; Abid, M.; Lassri, H.; Berrada, A.; Hamdoun, Abdellatif; Krishnan, R.

doi:10.1016/j.mseb.2004.09.008

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…The interface anisotropy strongly affects the thickness dependence of the magnetization. The linear relation between the spin-wave parameter B and the reciprocal of the magnetic film thickness was reported for Co/V, Ni/Pt multilayers [56,57] and Fe(110) films on W(110) [58,59].…”

Section: Resultsmentioning

confidence: 82%

Experiment and Theoretical Study of Critical Behavior in Magnetic Multilayers

Masrour

Hamedoun

Benyoussef

et al. 2012

J Supercond Nov Magn

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Ni/NM multilayers (with noble metal NM = Au, Ag and Cu) were prepared by the electron beam evaporation method under ultra high vacuum conditions. The magnetic properties of Ni/NM multilayers are examined as a function of Ni layer thickness t Ni . The temperature dependence of the spontaneous magnetization M(T ) is well described by a T 3/2 law in all multilayers. A spin-wave theory has been used to explain the temperature dependence of the magnetization and the approximate values for the bulk Exchange interaction J b and surface exchange interaction J s for various Ni layer thicknesses have been obtained.In the other hand we have used the high-temperature series expansion technique, to analyze the phase transition and the critical phenomena of a ferromagnetic a two-component multilayer, through three models: Ising, XY and Heisenberg. The critical reduced temperature τ c (ν) is studied as function of the thickness of constituents in the unit cell of the mul-R. Masrour ( ) Laboratory of Materials, Processes, Environment and Quality, tilayer. In the two-component multilayer τ c (ν) is studied as function of the exchange interaction in each material and within the interface J s , J b and J ⊥ , respectively. A critical value of the surface exchange interaction in the film and interface exchange interaction in the multilayer above which the surface and the interface magnetism appears is obtained. The dependence of the reduced critical temperature on the thickness of the film and the unit cell of multilayer has been investigated. The effects of an amorphous magnetic surface on the critical properties of the film of simple cubic lattice have been studied. A number of characteristic behaviors, such as the possibility of the existence of a critical length of the unit cell thickness at which the temperature of the multilayer remains insensitive to the exchange coupling within interface, are reported.In a defined range of the exchange interactions, the values of γ are comparable to the universal ones and are independent of the film thickness. The asymmetry of the structure and the competition of the effects of the exchange coupling are important for the magnetic properties of the system.

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Section: Resultsmentioning

confidence: 82%

Experiment and Theoretical Study of Critical Behavior in Magnetic Multilayers

Masrour

Hamedoun

Benyoussef

et al. 2012

J Supercond Nov Magn

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“…The t Co -independent fit parameter M s,Ni+X for Co/Ni/Pd equals 272 kA/m. Beside the magnetization of the Ni layer, the Pd layer polarized by Co [30] and Ni [54] [55], which leads to an effectively lower magnetization for the Ni and Pt layers. If we compare the two insertion layers magnetization-wise, it is important to note that the repetition number of [Co(t Co )/Ni(0.4)/Pt(0.6)] 4 is lower than that of [Co(t Co )/Ni(0.4)/Pd(0.6)] 9 .…”

Section: A Co Layer Thickness Dependencementioning

confidence: 99%

Magnetic properties of Co/Ni-based multilayers with Pd and Pt insertion layers

Heigl,

Wendler,

Haugg

et al. 2020

Preprint

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In this study, the influence of Pd and Pt insertion layers in Co/Ni multilayers (MLs) on their magnetic properties, e.g. magnetic anisotropies, saturation magnetization, coercivity, magnetic domain size, and Curie temperature, is investigated. We compare three series of [Co/Ni/X] N ML systems (X = Pd, Pt, no insertion layer), varying the individual Co layer thickness as well as the repetition number N. All three systems behave very similarly for the different Co layer thicknesses. For all systems, a maximum effective magnetic anisotropy was achieved for MLs with a Co layer thickness between 0.15 nm and 0.25 nm. The transition from an out-of-plane to an in-plane system occurs at about 0.4 nm of Co. While [Co(0.2 nm)/Ni(0.4 nm)] N MLs change their preferred easy magnetization axis from out-of-plane to in-plane after 6 bilayer repetitions, insertion of Pd and Pt results in an extension of this transition beyond 15 repetitions. The maximum effective magnetic anisotropy was more than doubled from 105 kJ/m 3 for [Co/Ni] 3 to 275 and 186 kJ/m 3 for Pt and Pd, respectively. Furthermore, the insertion layers strongly reduce the initial saturation magnetization of 1100 kA/m of Co/Ni MLs and lower the Curie temperature from 720 to around 500 K.

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