MAGNETIC AND OPTICAL PROPERTIES OF COBALT-SUBSTITUTED RbNiF3

Abstract
When nickel is replaced by cobalt in RbNi1–xCoxF3, the hexagonal structure and the ferrimagnetic order are maintained; however, the easy axis of magnetization at 77°K rotates in a complex manner from perpendicular (x < .07) to parallel to the optic axis (x > .17). In the optical window region at 17,000 cm−1 the bulk absorption remains constant at 5 cm−1 and the Faraday rotation increases to 200 deg/cm at x = .25.

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