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Soft magnetic properties of nanocrystalline amorphous HITPERM films and multilayers

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4 Author(s)
Huang, M.-Q. ; Dept. of Mater. Sci. & Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA ; Hsu, Y.-N. ; McHenry, M.E. ; Laughlin, D.E.

Amorphous precursors to HITPERM (Fe, Co)-Zr-B-Cu (a-HITPERM) films and a-HITPERM/SiO2 multilayer films have been deposited on glass or Si substrates by a rf sputtering system with a target of composition (Fe0.7Co0.3)88Zr7B4 Cu1. It was found that the a-HITPERM single layer film with a thickness of 100 mm possessed good soft magnetic properties with a saturation magnetization of 4πMs⩾14 kG and a coercivity of Hc~0.9 Oe at room temperature. Hc increases from 0.9 Oe to 25 Oe when the him thickness increases from 100 to 150 nm. To obtain excellent soft magnetic properties at larger thicknesses, a-HITPERM/SiO2 multilayer films have been synthesized. In these, Hc drops from 25 Oe (single layer) to 0.25 Oe (multilayers) with the same total a-HITPERM thickness. The intervening SiO2 layers play an important role in reducing the coercivity. Experimental results show the optimum thickness for SiO2 was 2-4 nm. M-H loops for the multilayers films exhibit pronounced two step magnetization reversal processes for temperatures between 5 and 25 K. This behavior can be attributed to magneto-static coupling between a-HITPERM layers and sequential switching of the layers. The coupling exhibits itself in a blocked phenomenon with wide (stepped) hysteresis curves for T<25 K and smooth narrow hysteresis curves for T>25 K. The effects of magneto-static coupling on the magnetic properties of a-HITPERM/SiO2 films will be discussed

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )