1 F NOISE IN MONOCRYSTALLINE AND POLYCRYSTALLINE ALUMINUM/

The 1/f noise in three types of aluminum lines has been investigated i n the temperature range 140-510 K. The types are one long single cryst al, a chain of short single crystals (''bamboo''), and a polycrystal. In the lines of the first two types the 1/f noise power is significant ly lower than in the polycrystalline specimens. The temperature depend ence of the noise power in the polycrystalline lines shows a plateau b etween 370 and 415 K, corresponding to activation energies 0.9-1.0 eV. Both types of monocrystalline lines have equal noise power with a pea k around 340 K, corresponding to an activation energy of about 0.8 eV. In the polycrystalline lines the dominant contribution to 1/f noise a ppears to be the thermally activated motion of atoms in grain boundari es. The measurements on the monocrystalline lines reveal the existence of at least one further contribution to 1/f noise in metals, presumab ly associated with the thermally activated diffusion of atoms along di slocations.