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We report measurements of the low temperature (T = 0.5 K) oscillatorymagnetization in a high-density array of 50 micron diameter wires ofpolycrystalline Bi utilizing a high sensitivity silicon cantilevermagnetometer. We find that the magnetic response is strongly anisotropic, beingmuch larger for magnetic field perpendicular than for fields parallel to thewire-axis. We argue that this is a geometric effect caused by the large aspectratio of the individual microwires in the array. The magnetic response of themicrowires is dominated by the light electrons due to the larger cyclotronorbits in comparison with the heavier holes. We find that de Haas - van Alphenoscillations are easily resolved, and discuss the application of this techniqueto the study of Bi nanowire arrays.Comment: 21 pages, 7 figure

Magnetic Anisotropy and de Haas–van Alphen Oscillations in a Bi Microwire Array Studied via Cantilever Magnetometry at Low Temperatures