Markayendeyulu G

The structural and magnetic properties of Nd3 (Fe1-x Alx) 27.5 Ti1.5 (x=0.1-0.4) were investigated by x-ray diffraction, magnetization, and Curie temperature (TC) measurements. The unit cell volume increases with the Al substitution, in accordance with the larger atomic radius of Al. The saturation magnetization and the Curie temperature decrease with increasing Al content, and the decrease is attributed to the modification of the density of states of 3d band due to the 3p band of Al and to the magnetic dilution effect. The easy direction of magnetization is along the b axis for x=0.4. The anisotropy field (HA) decreases with increasing Al concentration. © 2006 American Institute of Physics.

The effect of Al on the structural and magnetic properties of Pr3 (Fe1-x Alx) 27.5 Ti1.5 (x=0.1, 0.2, and 0.3) compounds has been investigated by x-ray-diffraction, magnetization, and Curie temperature measurements. All these compounds have formed in monoclinic symmetry with A2m space group with Pr(Fe,Ti) 12 as secondary phase and traces of α-Fe. The monotonic decreases in MS both at 300 and 80 K are discussed on the basis of electron transfer from the 3p band of Al to the 3d band of Fe near EF. The variations in TC are explained using the Friedel approach. In all the compounds, the easy magnetization direction is away from the b axis. © 2006 American Institute of Physics.

We have investigated the structural and magnetic properties of Fe-N thin films, for a thickness range of 40-280 nm, grown on Si(100) substrates. The Fe-N films exhibit a structural transformation from ε-Fe3N phase to γ′-Fe4N phase with the increasing film thickness. The average grain size and saturation magnetization are found to increase with the increasing thickness. The smaller Fe-N grains and large strain inhibit more the domain wall motion and, therefore, the films exhibit an increase in coercivity with the decreasing thickness. The influence of structural properties, such as crystallographic phase, crystallite size, and surface roughness on the magnetic properties of saturation magnetization and coercivity, is demonstrated as a function of the film thickness. © 2013 Elsevier B.V. All rights reserved.

The effect of conventional annealing and Joule annealing on magnetoimpedance (MI) of Co68 Fe5 Si12 B15 ribbons was studied. The ribbons used for the MI measurements were 1 and 5 cm long. The as cast 5-cm-long ribbons exhibit a larger MI compared with the 1-cm-long ribbons, at all frequencies. The maximum MI of the as cast ribbons of 5 cm length is 17% at 600 kHz whereas for the 1-cm-long ribbons it is 3% at 500 kHz. Conventional annealing carried out at 200 and 300 °C for 1 h results in the decrease of the MI in both the 5 and 1-cm-long ribbons, respectively. The Joule annealing of the 5-cm-long ribbons employing a current of 500 mA for 5 min. causes the increase of the MI to 26% at 800 kHz. For the 1 cm Joule-annealed ribbon, employing a current of 500 mA for 5 min., the maximum MI observed is 6% at 500 kHz. © 2006 American Institute of Physics.

[formula omitted] and [formula omitted] thin films were prepared by rf magnetron sputtering on oxidized silicon and lead zirconate titanate (PZT) substrates. Both the films were found to crystallize in inverse spinel structure after the annealing was carried out at 1073 K for two hours. Small hysteresis was observed in both the films at 300 K as well as 1.8 K. The magnetoelectric coefficient [formula omitted] is seen to have the largest value at 500 Oe and is 4.07 and [formula omitted] in [formula omitted] and [formula omitted] composite films, respectively. © 2010, American Institute of Physics. All rights reserved.

The structural and magnetic properties of Co substituted (Sm0.4Pr0.6)3(Fe1_xCox)27.5Ti1.5 [x = 0.1, 0.2,0.3, 0.4] compounds have been studied through powder X-ray diffraction (XRD) and magnetization measurements. All the compounds have formed in mon-oclinic R3(Fe,M)29phase with A2/m space group. The unit cell volume decreases with Co concentration in accordance with its size. The magnetization at room temperature increases with Co substitution and is qualitatively explained on the basis of rigid band approximation. Curie temperature is also found to increase with Co concentration. XRD patterns on the magnetically oriented samples reveal that nearly axial anisotropy is obtained for the x = 0.4 compound and that the easy magnetization direction (EMD) is along [2 0 4]. © 2006 IEEE

The structural and magnetic properties of Gd3(Fei1-xAlx)27.5Ti1.5 (0.1-0.4) have been investigated by X-ray diffraction (XRD), magnetization and Curie temperature (Tc) measurements. All the compounds have formed in Nd3 (Fe,Ti)29 (3:29) type structure with Gd(Fe,Ti)12 (1:12) phase as the secondary phase and traces of α-Fe. The unit cell parameters increase anisotropically with the A1 content. The saturation magnetization decreases with increasing A1 and is attributed to the magntovolume effect and the modification of the density of states (DOS). The increase of Curie temperature up to x = 0.3 and subsequent decrease is explained on the basis of band narrowing. The easy direction of magnetization (EMD) is away from the ab-plane up to x = 0.3 changes to along ab-plane for x = 0.4. © 2006 IEEE

The structural and magnetic properties of (Sm0.9 Pr0.1) 3 (Fe1-x Alx) 27.5 Ti1.5 [x=0.1,0.2,0.3] compounds have been investigated by x-ray diffraction, magnetization, and Curie temperature measurements. The lattice parameters are found to increase with increasing Al concentration. The saturation magnetization is seen to decrease with the substitution of Al and is attributed to the modification in the DOS by Al. The Curie temperature increased for low concentrations of Al and then decreased. The easy direction of magnetization (EMD) in all the compounds is normal to the (204) plane. The anisotropy fields decrease with increasing Al concentration. © 2005 American Institute of Physics.