Microstructure and soft magnetic properties of CoFeZrO thin films

Nanogranular CoFeZrO thin films were successfully prepared by radio frequency reactive magnetron sputtering in O₂/Ar atmosphere. The magnetic properties and microstructure were investigated. It is found that the Co_17.08Fe_49.76Zr_16.24O_16.91 films show the best soft magnetic properties: magnetic coercivity of 0.3 Oe; anisotropy field of 44.9 Oe; saturation magnetization of 16.8 kG; electrical resistivity of 462.8 μΩ cm. The effective permeability of the films reaches 800 and flattens up to 2 GHz.     

One-dimensional AGMI sensor with Co<Subscript>66</Subscript>Fe<Subscript>4</Subscript>Si<Subscript>15</Subscript>B<Subscript>15</Subscript> ribbon as sensing element

A novel asymmetric giant magneto impedance (AGMI) sensor was developed and the performance of the sensor was carefully studied. This one dimensional sensor can be further developed as a two-dimensional compass that can be used for navigational purposes. We used commercial Metglas 2714A ribbon. The sensor uses Co₆₆Fe₄Si₁₅B₁₅ ribbon as a sensing element. The results showed for high sensitivity and resolution. The GMI sensor consists of a crystal oscillator voltage to current converter for providing the current to the sample, a differential amplifier, successive amplifier stages, multiplier, and cascaded low-pass filters. The observed sensitivity was 25 V/Oe. Angle sensitivity was found to be 2 mV/degree. Our sensor showed excellent linearity when compared with previous sensors [13, 14]. These sensors require dc bias coils and two sensor elements to attain good linearity. PACS 85.75.Ss; 85.70.Ay; 85.70.-w; 85.75.-d; 75.30.Gw; 75.50.Kj; 75.90.+w     

Synthesis,antimicrobial and antioxidant activity of bis sulfonamide/carbamate derivatives of bis-(4-aminophenyl) methane

A series of new bis sulfonamide/carbamate derivatives of bis-(4-aminophenyl)methane 3 ( a–d )/ 5 ( a–f ) were synthesized from bis-(4-aminophenyl)methane ( 1 ) using various pharmacologically active sulfonyl chlorides 2 ( a–d ) and carbonochloridates 4 ( a–f ) in high yields. The structures of all the newly synthesized compounds were characterized by the Infrared spectroscopy, NMR (¹H and ¹³C), mass, and elemental analyses. Further, all the synthesized compounds were tested for the antioxidant activity by using 2, 2-diphenyl-1-picrylhydrazyl, NO, and H₂O₂ scavenging methods and antimicrobial activity. Most of the compounds exhibited good antioxidant and antimicrobial activities.