Magnetic properties of Co<i>x</i>Ni1−<i>x</i>/Pt multilayers

Krishnan, R.; Lassri, H.; Seddat, M.; Porte, M.; Tessier, M.

doi:10.1063/1.111628

Cited by 32 publications

(15 citation statements)

References 6 publications

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“…The K s determined in this way compares well with results from magnetic layer thickness series from various authors (e.g. [8]). From this good match we conclude that the choice of the argon pressure at which the multilayer is in the stress-free state is justified.…”

Section: Resultssupporting

confidence: 71%

The effect of stress and magnetostriction on the anisotropy of CoNi/Pt multilayers

Drent

Bijker

Lodder

1996

Journal of Magnetism and Magnetic Materials

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Section: Resultssupporting

confidence: 71%

The effect of stress and magnetostriction on the anisotropy of CoNi/Pt multilayers

Drent

Bijker

Lodder

1996

Journal of Magnetism and Magnetic Materials

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“…1 is calculated using the above values and it is seen that the experimental points align very well. This result is similar to what we had obtained in Co-Ni/Pt system [6] and thus brings additional support to our hypothesis that the contribution from magneto-elastic effects to Ks is negligible. Let us also recall that the magnetostriction in Co-Ni alloys varies in a complex manner and even changes sign [11].…”

Section: Magnetic Anisotropysupporting

confidence: 81%

“…This point is of great importance for application. We showed that the surface anisotropy (Ks ) in this system varied linearly with the Co concentration which is of fundamental importance as we have discussed in our work [6]. We attributed this behaviour also to the fact that the magneto-elastic contribution to Ks is negligible if not absent.…”

mentioning

confidence: 50%

“…Hashimoto et al [4] have carried out actual recording on Co/Pt discs at a wavelength of 488 nm. New class of materials based on Co-Ni/Pt instead of pure Co/Pt have also been proposed recently [5,6,7] which show similar properties as Co/Pt but with a relatively lower Curie temperature of the order of 250°C. Writing at such temperatures is far more safer and will not cause any interfacial diffusion.…”

mentioning

confidence: 99%

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ANISOTROPY AND MAGNETO-OPTICAL KERR SPECTRA OF CaXNi1-X/Au MULTILAYERS

Krishnan¹,

Seddat²,

Porte³

et al. 1996

J. Magn. Soc. Jpn.

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Abstract:We have prepared CaxNi I-x/Au multi layers by evaporation and studied their magnetic properties and magneto-optical Kerr spectra. With the addition of Co the surface anisotropy increases linearly and stabilises the perpendicular magnetisation. For x= 0.7 the sample with magnetic layer thickness of 5.4 A shows a rectangular loop with a maximum coercivity of 800 Oe. For thinner Co-Ni layers the Kerr peak due to the interband transitions of Au is clearly seen but for thicker layers it is the CO-Ni like behaviour. The spectra could be well explained by the electromagnetic model. [5,6,7] which show similar properties as Co/Pt but with a relatively lower Curie temperature of the order of 250°C. Writing at such temperatures is far more safer and will not cause any interfacial diffusion. This point is of great importance for application. We showed that the surface anisotropy (Ks ) in this system varied linearly with the Co concentration which is of fundamental importance as we have discussed in our work [6]. We attributed this behaviour also to the fact that the magneto-elastic contribution to Ks is negligible if not absent. It was interesting to study other systems to verify this conclusion and we chose the system based on Au, since Co/Au has been intensely studied in the past [8,9]. We had shown that in Ni/Au multi layers where Ks is negative which is rather unusual [10]. We describe in this work the magnetic and the magneto-optical properties of (Co x Nil-x)/Au multi layers prepared by evaporation. EXPERIMENTAL DETAILSThe multilayers were prepared by sequential evaporation using a dual e-beam under ultra high vacuum conditions. The details of the deposition can be found in rer. 2. For depositing Cox Nil-x alloy layers, we first prepared an alloy ingot and used it as a source. We have subsequently determined the composition by analysing 1500 A thick layer. No difference in the composition between the source and the layer could be detected. Both glass and silicon were used as substrates. First Au buffer layer 100 A thick was deposited at room temperature and then annealed at 200°C for 2 hours. The multilayers were then grown on this buffer layer at room temperature. The Au layer thickckness t(Au) was kept constant at 15 A and that of Co-Ni was varied in the range 4 to 30 A.The growth parameters will be designated as {t(Co,Ni), t(Au)} x N where N stands for the number of bilayers. The top layer was Au layer 20 A thick which also served as a protective layer.Low and high angle X-ray diffraction studies were made to verify the periodic structure and to calculate the layer thicknesses. Magnetization was measured using a vibrating sample magnetometer (VSM) and the anisotropy was determined by a home made sensitive torque meter. The above properties were measured in the temperature range 6 to 300K. Magneto-optical polar Kerr spectra were studied at 295 K in the photon energy range from 1.5 to 5.2 eV. Kerr loops were also taken. RESULTS AND DISCUSSIONS Magnetic anisotropy0.5

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“…Lower stability of the small stored bits is then obtained. The high Curie temperature of the CoIPt, which is responsible of a rather low writing sensitivity, can be reduced by alloying cobalt with nickel [9]. The writing sensitivity can also be improved using a seed layer of mixed tin and indium oxide [lo].…”

Section: Multilayers Of Very Thin Films (Less Than 1 or 2 Nm) Of Colnmentioning

confidence: 99%

Thin Films and Fine Powders of Ferrites : Materials for Magneto-Optical Recording Media

et al. 1997

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Magnetic properties of CoxNi1−x/Pt multilayers

Cited by 32 publications

References 6 publications

The effect of stress and magnetostriction on the anisotropy of CoNi/Pt multilayers

The effect of stress and magnetostriction on the anisotropy of CoNi/Pt multilayers

ANISOTROPY AND MAGNETO-OPTICAL KERR SPECTRA OF CaXNi1-X/Au MULTILAYERS

Thin Films and Fine Powders of Ferrites : Materials for Magneto-Optical Recording Media

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