Magnetism of Co layers in a Co/Si multilayer film

Vas’kovskiya, V. O.; Patrin, G. S.; Великанов, Д. А.; Svalov, A. V.; Savin, P. A.; Yuvchenko, A. A.; Щеголева, Н. Н.

doi:10.1134/s1063783407020199

Cited by 13 publications

(3 citation statements)

References 7 publications

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“…Then, the extrapolated value of the film thickness (h ~ 5 nm), for which the spontaneous magnetism vanishes, corresponds to h eff~ 0.5 nm (or a grain size of ~0.5 nm). It should be noted that an analogous size effect was observed for cobalt films in Co/Si multilayers [10], for which it was shown that the spontaneous magnetism vanished in pure Co films with a thickness of 0.3 nm. These data are in agreement with our results.…”

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confidence: 73%

Synthesis and magnetic properties of nanocolumnar nickel films deposited in argon-nitrogen atmosphere

et al. 2012

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In recent years, much research effort has been devoted to obtaining arrays of organized nanostruc tures, which offer promising applications in semicon ductor technology, magnetooptics, sensor technology, and data storage devices [1][2][3]. Special attention has been given to arrays of magnetic nanowires, which have good prospects as magnetic recording media. However, fabrication of structures with desired char acteristics on a submicron scale requires using expen sive and laborious methods of electron beam and focused laser beam lithography. An alternative approach to obtaining magnetic nanowires is based on non catalytic synthesis of nanocolumnar film struc tures [4]. The formation of nitride-carbon nanotubu lar structures, which grow perpendicular to a substrate in the course of magnetron sputtering of a target, takes place provided that nitrogen is present in the growth atmosphere. This notion concerning the role of nitro gen is confirmed, in particular, by the growth of fullerene like films of carbon nitride [5].The process of magnetron sputtering of magnetic metals with the formation of nanocolumnar film structures is almost unstudied. The present work was aimed at obtaining nanocolumnar nickel films by magnetron sputtering in a nitrogen containing atmo sphere and studying the magnetic properties of these films with allowance for the presence of nitrogen dis solved in the deposited metal.The samples of nanocolumnar nickel films on glass substrates were prepared by the magnetron sputtering of a nickel target (special purity grade Ni) in argon atmosphere containing 2 vol % N 2 . The working pres sure of the gas mixture was ~25 Pa and the substrate temperature was ~530 K. A series of films were pre pared by sputter deposition at a constant rate (~10 nm/min) for various times (3-60 min), so that the corresponding film thicknesses varied from ~30 tõ 600 nm. The surface morphology of films was studied and their thicknesses (in the transverse cleavage) were determined by field emission scanning electron microscopy (SEM) on a JSM 6490 LV (JEOL) instru ment. The relative content of nitrogen in the samples was determined by energy dispersive X ray (EDX) spectroscopy using an INCA Penta FETx3 (Oxford Instruments) attachment. The structure of samples was studied by X ray diffraction (XRD) on a DRON 3 instrument using CoK α radiation.The saturation magnetization and its temperature dependence in nickel films were studied using an induction-frequency setup [6], in which a change in the resonance frequency ΔF ∝ ΔM = f(H) was mea sured for an oscillatory circuit with a sample placed in the induction coil. Using this method, it is possible to directly measure the saturation magnetization of a fer romagnetic film. The principle of measurement is based upon the fact that the sample is essentially two dimensional. When this sample is magnetized perpen dicular to its plane, a "demagnetizing" field is equal to the saturation magnetization 4πM S (in the SGSM sys tem). If the applied magnetic field H ext is varied, the setup measur...

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confidence: 73%

Synthesis and magnetic properties of nanocolumnar nickel films deposited in argon-nitrogen atmosphere

et al. 2012

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“…From this perspective there is a promising way of a multilayer systems creation on the basis of ferromagnetic metal and semiconducting layers. Nevertheless, the interpretation of results from such structures is very difficult with the main complexities related to the high influence of interfaces quality and diffusion processes between dissimilar phases on the resulting properties of formed metal-semiconductor compounds [1][2][3][4][5][6]. A microstructure of the FM/ semiconductor ML film can vary significantly, depending on the alternating layers thickness and their chemical activity; and the variations in the MO response from such ML structures also will be substantially different.…”

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confidence: 99%

Magneto-Optical Response Amplification In Multi-Layer Nanocomposite-Semiconductor Structures

et al. 2018

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The spectral and field dependences of the Transversal Kerr Effect (TKE) for (Co40Fe40B20)Z(SiO2)100-Z/Si (or С) multilayer (ML) nanocomposite-semiconductor structures were studied depending on the concentration of the nanocomposite layer ferromagnetic phase (Z), chemical of semiconductor layer and its thickness. It was found that under certain conditions an addition of thin nonmagnetic semiconductor layer leads to the increase of a multilayer magneto-optical (MO) response and softening of the magnetic properties of ML structure, up to the appearance of ferromagnetic (FM) ordering. The observed anomalous changes in magnetic and MO properties are well correlated with abrupt changes in the electric properties of ML structures. Decreasing of ferromagnetic phase concentration Z in the nanocomposite layer as well as increasing of the semiconductor layer thickness led to the disappearance of anomalous behavior in the MO properties. The results obtained are discussed taking into account the formation of a new magnetic phase on the FM granule-semiconductor interface.

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“…For MFCNTs eff K value can be estimated by the shape anisotropy (Vas'kovskiya et al, 2007). This implies, taking into consideration the experimental data, that in 5%-samples the decrease of anisotropy occurs faster as the temperature increases in comparison with the decrease of magnetization.…”

Section: Magnetic Properties Of Cnt Arrays Synthesized By the Injectimentioning

confidence: 99%

Synthesis and Properties of the Arrays of Magnetically Functionalized Carbon Nanotubes

Лабунов¹,

Prudnikava²,

Yanushkevich³

et al. 2011

Carbon Nanotubes Applications on Electron Devices

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Magnetism of Co layers in a Co/Si multilayer film

Cited by 13 publications

References 7 publications

Synthesis and magnetic properties of nanocolumnar nickel films deposited in argon-nitrogen atmosphere

Synthesis and magnetic properties of nanocolumnar nickel films deposited in argon-nitrogen atmosphere

Magneto-Optical Response Amplification In Multi-Layer Nanocomposite-Semiconductor Structures

Synthesis and Properties of the Arrays of Magnetically Functionalized Carbon Nanotubes

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