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.

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This letter reports on the magnetic properties of Fe/Co and Fe/CoFe multilayer films. A zero magnetostriction is realized by changing the thickness of each layer. In addition, Fe/Co films with high magnetization of more than 2 T and good soft-magnetic properties of 1.5 Oe coercivity are confirmed. By 300 °C annealing, the hard-axis coercivity in Fe/Co films decreases to 0.8 Oe. Furthermore, a suitable magnetic domain structure for a thin-film head is confirmed, and the structure is found to be determined by the total magnetostriction.

This paper investigates the critical current density (Jc) of sintered YBa2Cu3O7−x thick film prepared by the screen printing method. Two thick films with different crystal morphologies, which exhibit a Jc of 70 and 700 A/cm2 at 77 K, are compared in terms of crystal orientation, the pinning force in the grains, and the pinning force at the grain boundaries. Both these thick films exhibit random crystal orientations, and have many weak links. An M-H examination suggests that these two thick films have similar pinning forces in the grains, and no anisotropy of the pinning force. The larger Jc-H hysteresis exhibited in the film with the larger Jc implies an improvement in the pinning force at the grain boundaries. This improvement may cause the larger Jc.