Magnetoresistivity of micron size (10.0) epitaxial Co wires

Magnetoresistivity effects in association with the magnetic domain structur e were studied by using 1 mu m wide epitaxial (10.0) Co wires oriented para llel and perpendicular to the magnetic easy [001] axis. The parallel wire e xhibited a large anisotropy magnetoresistivity ratio of similar to 11 % at 5 K, which turned to be negative above 214 K due to the temperature variabl e anisotropic magnetoresistivity effect. A negative domain wall contributio n to the resistivity was observed only in the temperature range from 200 K to 220 K, On the contrary, the perpendicular wire exhibited a small positiv e wall contribution ranging from 3 x 10(-4) mu Omega cm at 5 K to 6.9 x 10( -4) mu Omega cm at 300 K.