Anisotropic optical, magnetic, and electrical properties of obliquely evaporated Ni films

Otiti, Tom; Niklasson, Gunnar A.; Svedlindh, Peter; Granqvist, Claes G.

doi:10.1016/s0040-6090(97)00257-5

Cited by 22 publications

(8 citation statements)

References 27 publications

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“…As we note, for MOKE and FMR techniques, H E value does not exhibit the same overshoot as H u at high angle (a ¼ 70 ). This is an expected result since at high angles the same shadowing effect responsible for the increase of H u increases the roughness 6 and as a direct consequence, H E decreases.…”

Section: Resultsmentioning

confidence: 65%

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Angular dependence of hysteresis shift in oblique deposited ferromagnetic/antiferromagnetic coupled bilayers

Oliveira

Rodrı́guez-Suárez

Michea

et al. 2014

Journal of Applied Physics

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The angular dependence of the hysteresis shift has been investigated in ferromagnetic/antiferromagnetic (NiFe/IrMn) bilayers grown by oblique deposition under the influence of a static magnetic field applied perpendicular to the uniaxial anisotropy direction induced during the growth process. It was found that at low oblique deposition angles, the unidirectional anisotropy field is much greater than the uniaxial anisotropy field and the corresponding anisotropies directions are noncollinear. In these conditions, the angular dependence of the hysteresis loop shift exhibits the well know cosine like shape but demanding a phase shift. Contrary to this, at high oblique deposition angle (70°), the uniaxial anisotropy plays the fundamental role and the anisotropies directions are collinear. In this case, the exchange bias displays a jump phenomenon. The numerical calculations are consistent with the experimental data obtained from magneto-optical Kerr effect and ferromagnetic resonance.

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Section: Resultsmentioning

confidence: 65%

“…[1][2][3][4][5][6][7] This enhancement is explained by modification of the film microstructure due to the growing conditions. During oblique deposition, columnar grains are growth tilted toward the source of particles.…”

Section: Introductionmentioning

confidence: 99%

Angular dependence of hysteresis shift in oblique deposited ferromagnetic/antiferromagnetic coupled bilayers

Oliveira

Rodrı́guez-Suárez

Michea

et al. 2014

Journal of Applied Physics

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“…One such contribution originates from an anisotropic electric susceptibility of the alignment surface. Obliquely deposited films are expected to have an anisotropic response to electric stimuli (e.g., from mesogen dipoles) due to their dune-like or columnar surface textures. , Molecular monolayers can modify this anisotropy, dependent on the adsorbate polarizabilities and orientations on the surface. To examine this effect, molecular polarizability tensors ( α ) were calculated using density functional theory for each of the six carboranethiol and -dithiol isomers considered here (see Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Surface Dipole Control of Liquid Crystal Alignment

et al. 2016

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Detailed understanding and control of the intermolecular forces that govern molecular assembly are necessary to engineer structure and function at the nanoscale. Liquid crystal (LC) assembly is exceptionally sensitive to surface properties, capable of transducing nanoscale intermolecular interactions into a macroscopic optical readout. Self-assembled monolayers (SAMs) modify surface interactions and are known to influence LC alignment. Here, we exploit the different dipole magnitudes and orientations of carboranethiol and -dithiol positional isomers to deconvolve the influence of SAM-LC dipolar coupling from variations in molecular geometry, tilt, and order. Director orientations and anchoring energies are measured for LC cells employing various carboranethiol and -dithiol isomer alignment layers. The normal component of the molecular dipole in the SAM, toward or away from the underlying substrate, was found to determine the in-plane LC director orientation relative to the anisotropy axis of the surface. By using LC alignment as a probe of interaction strength, we elucidate the role of dipolar coupling of molecular monolayers to their environment in determining molecular orientations. We apply this understanding to advance the engineering of molecular interactions at the nanoscale.

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“…[22] Study of physical and chemical properties of nano rods to understand the advantages and limitations of this most widely used material is very attractive, which is why in recent years researchers have extensively studied their optical and electrical properties. [23][24][25][26] There are several methods for nano rods preparation, the most common of which is the physical vapor deposition at oblique angle (oblique angle deposition deposition). [18][19][20] The advantage of physical deposition method over chemical methods is the high purity of the obtained films and the control-lability of the size and shape of the nano rods by controlling the deposition parameters such as deposition rate, deposition angle, substrate seeds, substrate temperature and so on.…”

Section: Introductionmentioning

confidence: 99%

On the structural and optical properties investigation of annealed Zn nanorods in the oxygen flux*

Abdi¹

2021

Chinese Phys. B

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Zn nano rods were produced on glass substrates using oblique angle deposition method at different deposition angles. For oxidation, the samples were placed in a furnace under oxygen flux. AFM and FESEM images were used to morphology analysis of the structures. The results showed that with increasing the angle of deposition, the grain size decreases and the porosity of the structures increases. XRD pattern and XPS depth profile analysis were used to crystallography and oxide thickness investigations, respectively. The XRD results confirmed oxide phase formation, and the XPS results analyzed the oxide layer thickness. The result showed that as the deposition angle of the nanorods increases, the thickness of the oxide layer increases. The reason for the increase in the thickness of the oxide layer with increasing deposition angle was investigated and attributed to the increase in the porosity of the thin films. The optical spectra of the structures for p polarized light at 10° incident light angle were obtained using single beam spectrophotometer in the 300 nm to 1000 nm wavelengths. The results showed that the formed structures although annealed in oxygen flux, tend to behave like metal. To calculate the optical constant of the structures, the reverse homogenization theory was used and the void fraction and complex refractive index of the structures were obtained. Finally, by calculating permittivity and optical conductivity of the structures, their changes with the deposition angle were investigated.

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Anisotropic optical, magnetic, and electrical properties of obliquely evaporated Ni films

Cited by 22 publications

References 27 publications

Angular dependence of hysteresis shift in oblique deposited ferromagnetic/antiferromagnetic coupled bilayers

Angular dependence of hysteresis shift in oblique deposited ferromagnetic/antiferromagnetic coupled bilayers

Surface Dipole Control of Liquid Crystal Alignment

On the structural and optical properties investigation of annealed Zn nanorods in the oxygen flux*

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