T. Rausch et al., High frequency giant magnetoresistance in evaporated Co/Cu multilayers deposited on Si(111) and Si(100), J APPL PHYS, 85(1), 1999, pp. 314-318
We report giant magnetoresistance (GMR) in Co/Cu multilayers deposited usin
g high vacuum electron beam evaporation on Si(111) and Si(100). Samples gro
wn on Si(111) show enhanced magnetoresistance and coercivity, which may be
attributed to ill-defined interfacial boundaries between successive layers.
Previous work exploring the frequency dependency of GMR has been done usin
g microwave techniques to indirectly determine GMR. Our magnetoresistance d
ata was obtained by replacing one side of a square loop antenna with a Co/C
u multilayer and measuring the impedance. No effect on the magnitude of the
GMR, due to high frequency test signals, was observed for a frequency rang
e from dc to 5.5 GHz. (C) 1999 American Institute of Physics. [S0021-8979(9
9)05601-7].