A bsrrucr-This study reports on the performance of a thin-film magnetic sensor which uses the h i g h frequency magneto-impedance (HFMI) effect. I n order to obtain a high sensitivity and a large voltage change ratio (AVpp/Vpp(O) : corresponds t o the MR ratio), a strip pattern, a closed magnetic circuit, and a NiFe/Si02 multilayer film structure are adopted for the magnetic films of the sensor. A AVpp/Vpp(O) of 60-70 % is achieved by applying a n external magnetic fieid of several Oe. Moreover there is no hysteresis or no Barkhausen noise i n this sensor, which has a magnetic film width of 1 0 pm. In terms of linearity, the sensor exhibits a modulation degree ( m ) of 12 %and a total harmonic distortion (THD) of 0.8 %.

This paper reports the results of experimental and analytical investigations into the properties of ion-beam-sputtered Ni/Fe artificial lattice films. Through structure analysis, it is known that the Fe layer has poor crystallinity and the Ni layer has a face-centered-cubic structure with strong preferred orientation. Additionally, the Ni/Fe lattice film is found to possess good soft-magnetic properties with lower coercivity less than 1 Oe and uniaxial anisotropy as the lattice period is decreased. The saturation magnetization and magnetostriction are also confirmed to be controlled by changing the lattice period and the thickness of Ni and Fe layers. As a result of the simplest model analysis, the very small magnetostriction obtained in this experiment is thought to be realized by the balance in magnetostriction among Ni, Fe, and Ni-Fe interdiffusion layers. Furthermore, a good domain structure is observed in the Ni/Fe lattice film with very small magnetostriction.

This paper reports on the results of an experimental investigation into the magnetic properties of iron films formed by ion beam sputtering. Through the iron film formation at various nitrogen partial pressures and substrate angles, nitrogen ion bombardment is found to reduce the coercive force of the magnetic hard axis in addition to inducing uniaxial anisotropy. The decrease in the coercive force corresponds well to the increase in the nitrogen concentration and the anisotropy constant of the α-Fe-composed films. The uniaxial anisotropy is confirmed to mainly result from directional ordering rather than crystalline anisotropy. The magnetic properties of the film having well-defined uniaxial anisotropy are a coercive force of 0.3 Oe, a saturation magnetization of 2.2 T, an anisotropy field of 3.5 Oe, and a permeability of 5000.

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This paper reports the results of experimental investigations into the chemical shifts of Fe 2p, Ni 2p and N 1s in Ni-Fe alloy and Fe films. Through XPS analysis on Ni-Fe film composition, it is known that the binding energy of Fe0 2p increases and the satellite around 859 eV shifts toward lower binding energy with an increasing Ni fraction, instead of a Ni core level shift. Additionally, Fe species are confirmed to be more preferentially oxidized than those of Ni in the Ni-Fe alloy surface. Furthermore, an observed core level shift of N 1s infers that N in iron films formed in nitrogen atmosphere chemically reacts with Fe species even though these films were not made up of iron nitrides.