Rotation of rod-shaped particles (A) and cylinder-shaped particles (B) along the easy axis.

Abstract

<p>The particles were printed to achieve specific geometries, which allows the manifestation of shape anisotropy. The samples were placed in the VSM with the easy axis parallel to the direction of the applied field and rotated in increments of 15 degrees to measure the change in coercivity as the sample moves from easy axis to hard and further to easy axis, making half-a-turn of 180 degrees. Cylindrical particles 300 nm in diameter and 400 nm tall exhibit a coercivity of approximately 47 Oe, while the rod-shaped particles 300 nm wide, 400 nm tall and 1.2 micron long exhibit a coercivity of 167 Oe.</p