Researcher:
Zanjani, Saeedeh Mokarian

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PhD Student

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Saeedeh Mokarian

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Zanjani

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Zanjani, Saeedeh Mokarian

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2019 - 201912020 - 20215

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Now showing 1 - 6 of 6
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    Effect of laser pulse fluence, waveform and film thickness on ultrafast magnetization dynamics in nickel
    (Optica Publishing Group (formerly OSA), 2020) Department of Electrical and Electronics Engineering; N/A; Onbaşlı, Mehmet Cengiz; Zanjani, Saeedeh Mokarian; Faculty Member; PhD Student; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; 258783; N/A
    The effect of femtosecond laser pulse parameters on ultrafast magnetization dynamics in Nickel films is modeled. For Gaussian laser pulse (unlike sinc), Ni recovers its magnetization in one picosecond within an optimal laser fluence range.
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    PublicationOpen Access
    Predicting new iron garnet thin films with perpendicular magnetic anisotropy
    (Elsevier, 2020) N/A; Department of Electrical and Electronics Engineering; Zanjani, Saeedeh Mokarian; Onbaşlı, Mehmet Cengiz; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 258783
    Magnetic iron garnets are insulators with low Gilbert damping with many applications in spintronics. Many emerging spintronic applications require perpendicular magnetic anisotropy (PMA) although garnets have only a few PMA types (i.e. terbium and samarium garnet). More and stable PMA garnet options are needed for investigating new spintronic phenomena. In this study, we predict 20 new epitaxial magnetic iron garnet film/substrate pairs with stable PMA at room temperature. The effective anisotropy energies of 10 different garnet films that are lattice-matched to 5 different commercially available garnet substrates (total 50 film/substrate pairs) have been calculated using shape, magnetoelastic and magnetocrystalline anisotropy terms. Strain type, tensile or compressive depending on substrate choice, as well as the sign and the magnitude of the magnetostriction constants of garnets determine if a garnet film may possess PMA. We show the conditions in which Samarium, Gadolinium, Terbium, Holmium, Dysprosium and Thulium garnets may possess PMA on the investigated garnet substrate types. New PMA garnet films with tunable saturation moment and field may improve spin-orbit torque memory and compensated magnonic thin film devices.
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    PublicationOpen Access
    Modelling data for predicting new iron garnet thin films with perpendicular magnetic anisotropy
    (Elsevier, 2020) Department of Electrical and Electronics Engineering; N/A; Onbaşlı, Mehmet Cengiz; Zanjani, Saeedeh Mokarian; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; 258783; N/A
    These data include detailed calculations and graphs based on our manuscript submitted to Journal of Magnetism and Magnetic Materials, entitled “Predicting New Iron Garnet Thin Films with Perpendicular Magnetic Anisotropy”. These data are organized in two parts; first, we present the calculated plots of sensitivity of magnetic anisotropy field and anisotropy energy density for 49 epitaxial rare earth iron garnet (REIG) film/substrate pairs (a total of 98 plots, Figs. 1–15). In the second part, we present in Table 1 the complete details on the calculations for total magnetic anisotropy and all material constants used for each of 50 film/substrate pairs. The comparison with the previous experimental demonstrations is also shown in Table 1 (last column) and 2 with an accompanying discussion confirming the reliability of our model.
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    Predicting new iron garnet thin films with perpendicular magnetic anisotropy
    (Elsevier, 2020) Department of Electrical and Electronics Engineering; Zanjani, Saeedeh Mokarian; Onbaşlı, Mehmet Cengiz; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 258783
    Magnetic iron garnets are insulators with low Gilbert damping with many applications in spintronics. Many emerging spintronic applications require perpendicular magnetic anisotropy (PMA) although garnets have only a few PMA types (i.e. terbium and samarium garnet). More and stable PMA garnet options are needed for investigating new spintronic phenomena. In this study, we predict 20 new epitaxial magnetic iron garnet film/substrate pairs with stable PMA at room temperature. The effective anisotropy energies of 10 different garnet films that are lattice-matched to 5 different commercially available garnet substrates (total 50 film/substrate pairs) have been calculated using shape, magnetoelastic and magnetocrystalline anisotropy terms. Strain type, tensile or compressive depending on substrate choice, as well as the sign and the magnitude of the magnetostriction constants of garnets determine if a garnet film may possess PMA. We show the conditions in which Samarium, Gadolinium, Terbium, Holmium, Dysprosium and Thulium garnets may possess PMA on the investigated garnet substrate types. New PMA garnet films with tunable saturation moment and field may improve spin-orbit torque memory and compensated magnonic thin film devices.
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    PublicationOpen Access
    Thin film rare earth iron garnets with perpendicular magnetic anisotropy for spintronic applications
    (American Institute of Physics (AIP) Publishing, 2019) N/A; Department of Electrical and Electronics Engineering; Zanjani, Saeedeh Mokarian; Onbaşlı, Mehmet Cengiz; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 258783
    Perpendicular magnetic anisotropy (PMA) in garnet thin films is important for achieving numerous spintronic applications including spin-orbit switching. In this study, we computationally investigated how to control PMA by tuning substrate strain in Holmium Iron Garnet (HoIG) films grown on five different (111) single crystal garnet substrates of Gadolinium Gallium Garnet (GGG, Gd3Ga5O12), Yttrium Aluminum Garnet (YAG, Y3Al5O12), Terbium Gallium Garnet (TGG, Tb3Ga5O12), Substituted Gadolinium Gallium Garnet (sGGG, Gd3Sc2Ga3O12), and Neodymium Gallium Garnet (NGG, Nd3Ga5O12). The negative sign of effective anisotropy energy density, K-eff < 0, and anisotropy field, H-a < 0, determines the easy magnetization axis of the film to be perpendicular to the film surface. Here, we show that magnetoelastic anisotropy energy density determines the sign of the total anisotropy and it can be manipulated by altering the lattice parameter mismatch of the film and its substrate. Based on this study, HoIG is predicted to have PMA when grown on GGG, TGG and YAG among all five substrates mentioned. Moreover, the saturation field magnitude is calculated as an order of several hundreds of Oersteds, which is feasible in practical applications to saturate rare earth iron garnets with perpendicular magnetic anisotropy.
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    PublicationOpen Access
    All optical control of magnetization in quantum confined ultrathin magnetic metals
    (Nature Publishing Group (NPG), 2021) Department of Physics; Department of Electrical and Electronics Engineering; N/A; Müstecaplıoğlu, Özgür Esat; Onbaşlı, Mehmet Cengiz; Naseem, Muhammad Tahir; Zanjani, Saeedeh Mokarian; Faculty Member; Faculty Member; Department of Physics; Department of Electrical and Electronics Engineering; College of Sciences; College of Engineering; Graduate School of Sciences and Engineering; 1674; 258783; N/A; N/A
    All-optical control dynamics of magnetization in sub-10 nm metallic thin films are investigated, as these films with quantum confinement undergo unique interactions with femtosecond laser pulses. Our theoretical analysis based on the free electron model shows that the density of states at Fermi level (DOSF) and electron-phonon coupling coefficients (G(ep)) in ultrathin metals have very high sensitivity to film thickness within a few angstroms. We show that completely different magnetization dynamics characteristics emerge if DOSF and G(ep) depend on thickness compared with bulk metals. Our model suggests highly efficient energy transfer from femtosecond laser photons to spin waves due to minimal energy absorption by phonons. This sensitivity to the thickness and efficient energy transfer offers an opportunity to obtain ultrafast on-chip magnetization dynamics.