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Magnetic and magnetoresistive properties of CoFe/Au/Co/Au multilayered structures

Szymański B., Urbaniak M., Stobiecki F.

Materials Science Poland

2007

Vol. 25, No. 4

1275--1279

Sputter deposited (Co90Fe10 tCoFe/Au 2.7nm/Co 0.6nm/Au 2.7nm)10 multilayers with tCoFe in the 0.4-3.0 nm range were investigated. Magnetic reversal M(H) and magnetoresitance R(H) curves were measured. For tCoFe ??1.2 nm, the R(H) characteristics are similar to that of the prototype system (NiFe/Au/Co/Au), i.e. the system characterized by alternating in plane (NiFe) and out-of-plane (Co) magnetic anisotropy. However, for smaller tCoFe, the effective anisotropy of CoFe layers switches from the in-plane anisotropy to the perpendicular one. This transition is a reason of a strong decrease of the GMR amplitude for tCoFe 1.2 nm. The relatively large values of GMR amplitude (? 7%) and saturation field (900 kA/m) were obtained for sample with tCoFe = 3 nm, measured in perpendicular field configuration. The result indicates a distinct improvement of parameters important for application of studied films as magnetoresistive sensors characterized by the linear R(H) dependence in a broad range of magnetic field.

Temperature dependence of magnetization reversal in Ni80Fe20/Au/Co/Au multilayers

Szymański B., Stobiecki F., Urbaniak M.

Materials Science Poland

2006

Vol. 24, No. 3

849--853

In this contribution we present the results concerning temperature changes of magnetic properties of [Ni80Fe20(2 nm)/Au(tAu)/Co(tCo)/Au(tAu)]10 multilayers (MLs) with tAu = 1.5, 2.2 nm and tCo = 0.6, 0.8 nm. Hysteresis loops of investigated MLs were measured using vibrating sample magnetometer in temperature range from 175 to 423 K. Saturation field HSCo of Co layers, determined from the loops taken with in-plane applied field, increases with decreasing temperature. The HSCo field is directly related to perpendicular magnetic anisotropy of Co layer. It was also found that a shape of a central part of the hysteresis loops, taken with magnetic field applied perpendicular to the sample plane, is characteristic for samples with large perpendicular anisotropy and stripe domain structure. The shape of hysteresis loops is preserved in the whole temperature range of measurements indicating a presence of stable stripe domains. The magnetization reversal of the Co layers can be described by nucleation HN, annihilation HA and coercive HC fields. Temperature dependence of above mentioned parameters is presented.