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Comparative study of third harmonic generation in carbon and silicene nanotubes under magnetic fields.
Sci Rep
December 2024
Department of physics, Faculty of Science, Malayer University, Malayer, Iran.
This study investigates the optical properties of carbon nanotubes (CNTs) and silicene nanotubes (SiNTs) under the influence of external magnetic fields, focusing on their linear and nonlinear optical responses. A tight-binding model is employed to analyze the effects of magnetic fields on the electronic band structure, dipole matrix elements, and various optical susceptibilities of zigzag CNTs and SiNTs. The results reveal significant magnetic field-induced modifications in both linear and nonlinear optical spectra.
View Article and Find Full Text PDFIn this Letter, we calculate the optical and magneto-optical reflectivity in a dielectric/gap/ferromagnet excited by a -polarized monochromatic optical beam through the prism (Otto configuration) as a function of the angle of incidence and the gap thickness . Besides the well-known surface plasmon polariton (SPP resonance at ∼ ), we find a new, to the best of our knowledge, resonance with a nanometric gap ∼ 10 nm at a large ∼ 80°. Both resonances display pronounced resonant behavior in the transverse magneto-optical Kerr effect (T-MOKE).
View Article and Find Full Text PDFThin Films of BaM Hexaferrite with an Inclined Orientation of the Easy Magnetization Axis: Crystal Structure and Magnetic Properties.
Nanomaterials (Basel)
November 2024
Ioffe Institute, Politechnicheskaya 26, 194021 St. Petersburg, Russia.
Thin (~50 nm thick) BaM hexaferrite (BaFeO) films were grown on (1-102) and (0001) cut α-AlO (sapphire) substrates via laser molecular beam epitaxy using a one- or two-stage growth protocol. The advantages of a two-stage protocol are shown. The surface morphology, structural and magnetic properties of films were studied using atomic force microscopy, reflected high-energy electron diffraction, three-dimensional X-ray diffraction reciprocal space mapping, powder X-ray diffraction, magneto-optical, and magnetometric methods.
View Article and Find Full Text PDFEffects of Chiral Polypeptides on Skyrmion Stability and Dynamics.
Nano Lett
January 2025
Institute of Applied Physics, Faculty of Sciences, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
Magnetic skyrmions, topologically stabilized chiral spin textures in magnetic thin films, have garnered considerable interest due to their efficient manipulation and resulting potential as efficient nanoscale information carriers. One intriguing approach to address the challenge of tuning skyrmion properties involves using chiral molecules. Chiral molecules can locally manipulate magnetic properties by inducing magnetization through spin exchange interactions and by creating spin currents.
View Article and Find Full Text PDFModified Martin-Puplett interferometer for magneto-optical Kerr effect measurements at sub-THz frequencies.
Rev Sci Instrum
November 2024
National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia.
We present a magneto-optical Kerr effect (MOKE) spectrometer based on a modified Martin-Puplett interferometer, utilizing continuous wave sub-THz low-power radiation in a broad frequency range. This spectrometer is capable of measuring the frequency dependence of the MOKE response function, both the Kerr rotation and ellipticity, simultaneously, with accuracy limited by a sub-milliradian threshold, without the need for a reference measurement. The instrument's versatility allows it to be coupled to a cryostat with optical windows, enabling studies of a variety of quantum materials such as unconventional superconductors, two-dimensional electron gas systems, quantum magnets, and other systems showing optical Hall response at sub-Kelvin temperatures and in high magnetic fields.
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