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Magnetization studies were carried out for Tb–Co thin films and Tb–Co/FeNi bilayers, prepared by magnetron sputtering technique. The composition of the Tb–Co films varied in the range of 19–24 at.%. All Tb–Co films were found to have perpendicular magnetic anisotropy in a wide temperature range. In addition, for some Tb–Co films, a spin reorientation transition was observed in the investigated temperature range. An analysis of the obtained results suggests that, in the course of deposition of the FeNi layer onto the Tb–Co layer, an interlayer magnetic boundary is formed, and its parameters depend on the composition of the Tb–Co layer. The magnetic structure peculiarities of this boundary determine the value of the exchange bias in Tb–Co/FeNi bilayers and its temperature dependence. [ABSTRACT FROM AUTHOR]

The evolution of hysteresis and magnetoresistive properties of exchange-coupled Fe20Ni80/Tb–Co bilayers with modified interface was investigated in the temperature range from 79 to 450 K. Exchange bias field was shown to decrease monotonously with increasing temperature, demonstrating a very similar behavior for unmodified films and samples with ultrathin Ti spacer or selectively annealed permalloy layer. The observed dependence, therefore, is mostly attributed to the changes of the Tb–Co layer’s magnetization and magnetic anisotropy. Anisotropic magnetoresistance (AMR) value measured on all samples shown typical for the permalloy alloy reduction at higher temperatures regardless of the sample’s type. A simultaneous decrease of the exchange bias field and the value of the AMR effect was shown to open the possibility for the compensation of the temperature dependence of the medium’s response to the application of the external magnetic field. [ABSTRACT FROM AUTHOR]

Longitudinal and transverse magnetoimpedance is studied for Fe19Ni81 (150 nm)/Cu(500 nm)/Fe19Ni81 (150 nm) multilayered structures with exactly the same geometry, having either longitudinal or transverse magnetic anisotropy, at frequencies up to 500 MHz, convenient enough for technological applications. The highest sensitivity was observed for longitudinal magnetoimpedance of the structures with transverse magnetic anisotropy. Transverse magnetoimpedance ratio for structures with transverse magnetic anisotropy was small but transverse magnetoimpedance and its sensitivity for the structures with longitudinal magnetic anisotropy was quite high. Relatively high values of transverse and longitudinal magnetoimpedance for the structures with longitudinal anisotropy lead to the possibility to design a single sensitive element detector for the control of the magnetic fields, parallel and perpendicular to the element. [ABSTRACT FROM AUTHOR]

Presents a study which investigated the influence of the thickness of layers on magnetic properties of {cobalt-terbium}[subn], {cobalt-terbium}[subn]--cobalt, and {cobalt-terbium}[subn--cobalt--copper--cobalt films. Experimental procedure; Results and discussion; Conclusion.