Magnetic Anisotropy and Magnetostriction of Ordered and Disordered Cobalt-Iron Alloys

Abstract

The magnetic anisotropy and magnetostriction of single crystals of alloys between 25 weight % and 59 weight % cobalt in iron have been determined in the disordered and ordered states. The magnetostriction is large and positive for all alloys in both states of order (up to ${\text{150×10}}^{\text{−6}}$ for ${\lambda }_{100}$ and ${\text{40×10}}^{\text{−6}}$ for ${\lambda }_{111})$ . The magnetic anisotropy becomes zero near 41% Co for the disordered state. Ordering shifts the zero-anisotropy composition to about 50% Co.