Abstract
Aqueous electrodeposition of Sm-Co thin film magnetic alloys has been investigated with Hull cell and parallel electrodes using DC and pulse current (PC) methods. The basic solution consisted of 1M Sm sulfamate, 0.05M Co sulfate and 0.15M glycine. Most experiments were conducted at either 25oC or 60oC and various current densities (CD). Sufficient Sm deposit content was achieved to produce the SmCo5 (16.7 at % Sm) and Sm2Co17 (10.5 at % Sm) intermetallics by heat treatment. Parallel experiments confirmed the Hull cell results that increased temperatures and CDs increased Sm content of Sm-Co alloy deposits. Magnetic saturation decreased linearly and coercivity decreased nonlinearly with increased Sm content. Crystalline structures changed to non-crystalline with increase in Sm content. Increased Sm content tended to change magnetic properties from anisotropic to isotropic. For PC on parallel electrodes, higher PCD and lower bath temperatures increased Sm deposit content but decreased current efficiency.
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