Abstract
Composites of SmCo5-FeNi and SmCo5-FeCo, hard-soft magnetic materials, have been synthesized via electroless plating of magnetically hard SmCo5 powder particles with magnetically soft FeNi and FeCo, respectively. The influence of coating thickness of soft magnetic layers on the structure and magnetic properties of the composite has been studied. Overall FeNi coating was found to be less dense compared to FeCo for the same plating duration. Structurally the coat ing was found to be nodular in morphology. These coating have dramatic effect on the overall magnetic property of the composite. As compared to FeNi coated SmCo5 composite, two-fold increase in the saturation magnetization has been observed upon coating SmCo5 (Ms~28 emu/g) with FeCo to a value 56 emu/g. The coercivity of composite powder was found to decrease with increasing the coating layer thickness. The absence of exchange spring behavior in the hard-soft composite is attributed to magnetically soft layer thickness exceeding the theoretical length limit for exchange-spring coupling.
Highlights
Permanent magnetic materials are characterized by their figure of merit, (BH)max energy product, which is the maximum rectangular area under the second quadrant of the hysteresis loop
For materials with high HC values (HC > 2 Ms), the theoretical limit for the energy product is limited only by Ms and is given by (BH)max (2 Ms)2. Methods to overcome this limitation have focused on developing high anisotropy materials with high Ms and Curie temperatures (TC), materials which are based on rare-earth (RE)-transition metal (TM) intermetallics such as SmCo5, Sm2Fe17 and their boride or nitride compounds such as Nd2Fe14B and Sm2Fe17Nx [1,2,3]
Considering compatible magnetic properties of SmCo5 to Nd-Fe-B, and high magnetization of FeNi and FeCo as compared to -Fe, the present study explores the synthesis of hard-soft phase SmCo5-FeNi/FeCo composites via electroless plating technique
Summary
Permanent magnetic materials are characterized by their figure of merit, (BH)max energy product, which is the maximum rectangular area under the second quadrant of the hysteresis loop. 120 Magnetic Properties Hard-Soft SmCo5-FeNi and SmCo5-FeCo Composites Prepared by Electroless Coating Technique duced and highly dispersed throughout the magnet, the interaction between hard-soft phases could be significantly enhanced, leading to significant improvement in (BH)max energy product. Various techniques such as sputtering, pulse laser deposition (PLD), electrolytic coating, and electroless coating [13] have been explored to increase the interaction between hard-soft phases of the composite. Considering compatible magnetic properties of SmCo5 to Nd-Fe-B, and high magnetization of FeNi and FeCo as compared to -Fe, the present study explores the synthesis of hard-soft phase SmCo5-FeNi/FeCo composites via electroless plating technique. Magnetic properties of hard-soft phase composite are studied as a function of thickness of the soft magnetic layer
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