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4 publications

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    In Plane Oriented Strontium Ferrite Thin Films Described by Spin Reorientation

    By P. Samarasekara, Udara Saparamadu

    Abstract: For the first time, in plane orientation of magnetic easy axis of sputtered strontium hexaferrite thin films has been explained using modified Heisenberg Hamiltonian model with stress induced anisotropy term. The variation of average value of in plane spin component with temperature was plotted in order to determine the temperature at which easy axis is oriented in the plane of the strontium ferrite film. The average value of in plane …

    Published in Research & Reviews : Journal of Physics · Vol. 2, Issue 2, 2013 · pp. 12–16 Read article

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    Relationship between Demagnetization Factor and Energy of Thick Ferromagnetic Films

    By P. Samarasekara

    Abstract: The variation of energy of ferromagnetic thick films of 10000 layers with demagnetization factor will be described in this report using second order perturbed Heisenberg Hamiltonian. Under the influence of demagnetization factor given by =6.6, the sc(001) film with 10000 layers can be easily oriented in 0.6 radians direction for the values of energy parameters used in this report. Easy direction of thick fcc(001) film with 10000 layers was determined …

    Published in Research & Reviews : Journal of Physics · Vol. 1, Issue 3, 2012 · pp. 1–6 Read article

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    Demagnetization Factor Dependence of Energy of Ultrathin Ferromagnetic Films with Four Layers

    By P. Samarasekara

    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

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    Determination of Magnetic Properties of Cobalt Films Using Second Order Perturbed Heisenberg Hamiltonian

    By P. Samarasekara, Amila D. Ariyaratne

    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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