Elaboration, structure, microstructure and magnetic properties of soft Fe

The aim of the present work is to elaborate nanocrystalline soft Fe80Ni20 powders and to study the relationship between their magnetic behaviour and structural changes after different milling times. A series of Fe80Ni20 powders were elaborated by the mechanical alloying process for milling time ranging from 3 to 25 h. X-ray diffraction results showed that nickel dissolved in the iron lattice and formed a complete cubic centered (bcc) solid solution after 10 h of milling time. As the milling time increases from 0 to 25 h, the lattice parameter increases from 0.28610 nm for pure Fe to 0.28670 nm, the grain size decreases from 75 to 11 nm, while the mean level of strain increases from 0.09% to 0.5%. It is found that the saturation magnetization increases while the coercivity decreases when the milling time increases. The increase of saturation magnetization and decrease of coercivity are attributed to the decrease of the grain size with milling time. We have shown that nanocrystalline Fe80Ni20 powders exhibit a soft magnetic behaviour

Microstructure investigation and magnetic study of permalloy thin films grown by thermal evaporation

We study the effect of thickness on the structural and magnetic properties of permalloy thin films, evaporated on glass substrate. The films thicknesses range from 16 to 90 nm. From X-ray diffraction spectra analysis, we show that the thinner films present a ‹1,1,1› preferred orientation. However, the thicker films exhibit a random orientation. The grains size increases and the lattice parameter decreases with increasing thickness. The magnetic force microscopy observations display cross-tie walls features only for the two thicker films (60 and 90 nm thick films). The magnetic microstructure, carried out by Kerr microscopy technique, shows the presence of magnetic domains changing with the direction of applied magnetic field. The coercive field, Hc, was found to decrease from 6.5 for 16 to 1.75 Oe for 90 nm. All these results will be discussed and correlated

Structural and magnetic properties of Ni/Cu bilayers evaporated on CuZn substrate

In this present work we examine the effect of the Ni thickness t (t ranges from 4 to 67 nm) and of the Cu underlayer (with tCu = 27, 52 and 90 nm) on the structural and magnetic properties of Ni/Cu bilayers deposited onto CuZn substrate. The Ni films and the Cu underlayer have been deposited by thermal evaporation. The structural properties were derived from X-ray diffraction experiments. The texture, the strain B ε and the grain size D are studied as a function of Ni thickness. The surface morphology is studied by means of a scanning electron microscope (SEM). The magnetic properties were studied by means of the vibrating sample magnetometer (VSM) and the magneto-optic Kerr effect (MOKE) technique in the longitudinal configuration. The coercive field, the squareness and the saturation field are investigated as a function of Ni thickness. All these results will be discussed and correlated

Abstracts of 1st International Conference on Computational & Applied Physics

This book contains the abstracts of the papers presented at the International Conference on Computational & Applied Physics (ICCAP’2021) Organized by the Surfaces, Interfaces and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria, held on 26–28 September 2021. The Conference had a variety of Plenary Lectures, Oral sessions, and E-Poster Presentations. Conference Title: 1st International Conference on Computational & Applied PhysicsConference Acronym: ICCAP’2021Conference Date: 26–28 September 2021Conference Location: Online (Virtual Conference)Conference Organizer: Surfaces, Interfaces, and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria