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6 articles for “ferromagnetic thin films”
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Ferromagnetic thin Films with Simple Cubic Structure as Described by Fourth Order Perturbed Heisenberg Hamiltonian
Abstract: For the first time, fourth order perturbed Heisenberg Hamiltonian has been applied to study the properties of simple cubic structured ferromagnetic ultrathin films with two spin layers. Only the spin exchange interaction, second order magnetic anisotropy constant and the short-range magnetic dipole interaction were taken into account. Only when the second order anisotropy constant varies from one spin plane to the other spin plane, perturbation becomes nonzero. 3-D plots of …
Published in Journal of Nanoscience, NanoEngineering & Applications · Vol. 10, Issue 3, 2020 · pp. 35–43 Read article
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Third Order Perturbed Heisenberg Hamiltonian of BCC Ferromagnetic Ultra-Thin Films
Abstract: AbstractFor the first time, the solution of third order perturbed classical Heisenberg Hamiltonian equation with all the seven magnetic parameters including stress induced anisotropy and demagnetization factor is presented in this manuscript. Variation of third order perturbed total energy with applied in plane magnetic field, applied out of plane magnetic field, demagnetization factor and spin exchange interaction is described in this manuscript. Several peaks can be observed in each 3-D …
Published in Research & Reviews : Journal of Physics · Vol. 5, Issue 2, 2016 · pp. 23–30 Read article
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Spin Reorientation of CoPt/AlN and Gd Films Described by Third Order Perturbed Heisenberg Hamiltonian
Abstract: Spin reorientation of experimentally synthesized CoPt/AlN and Gd films has been described using third order perturbed Heisenberg Hamiltonian. Easy axis oriented ferromagnetic thin films find potential applications in magnetic memory devices and MMIC. Spin exchange interaction energy, long range dipole interaction energy, magnetic anisotropy energies, magnetostatic energy, stress induced anisotropy and demagnetization energy were taken into account. Values of these parameters of particular bulk magnetic materials were employed for this …
Published in Journal of Nanoscience, NanoEngineering & Applications · Vol. 11, Issue 1, 2021 · pp. 37–45 Read article
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Orientation of Easy Axis of Ferromagnetic Films as Explained by Third Order Perturbed Heisenberg Hamiltonian
Abstract: The third order perturbed Heisenberg Hamiltonian has been applied to explain themagnetic easy axis orientation. Ferromagnetic CoPt/AlN multilayer thin films withnumber of layers N=11, 16 and 21synthesized on fused quartz substrates using dcmagnetron sputtering technique have been employed as experimental data. According toexperimental research performed by some other researchers, easy axis of these fccstructured ferromagnetic films is oriented in the plane of the film above one particulartemperature. Average value of …
Published in Research & Reviews : Journal of Physics · Vol. 2, Issue 3, 2013 · pp. 5–9 Read article
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Determination of Magnetic Properties of Cobalt Films Using Second Order Perturbed Heisenberg Hamiltonian
Abstract: The magnetic properties of hexagonal closed packed structured ferromagnetic cobalt films were investigated by means of second order perturbed Heisenberg Hamiltonian. First the number of nearest neighbors and the constants arisen from the partial summation of the dipole interactions of the structure of cobalt were calculated using some special algorithms. Minimization of the energy difference between the easy and hard direction of a memory device is very important. When the …
Published in Research & Reviews : Journal of Physics · Vol. 1, Issue 1, 2012 · pp. 16–23 Read article
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Demagnetization Factor Dependence of Energy of Ultrathin Ferromagnetic Films with Four Layers
Abstract: The variation of energy with demagnetization factor will be investigated for sc(001) and bcc(001) ferromagnetic lattices with four layers using classical model of Heisenberg Hamiltonian. According to 3-D plots, the films with four layers can be easily oriented in certain directions under the influence of particular demagnetization factor and angles for both sc(001) and bcc(001) ferromagnetic lattice structures. A flat part can be seen in the middle of 3-D plots …
Published in Research & Reviews : Journal of Physics · Vol. 1, Issue 2, 2012 · pp. 1–8 Read article