52.7 kOe high coercivity in Sm(Co0.9Cu0.1)4.8 melt-spun ribbons

Abstract

Fine grained Cu substituted melt-spun Sm(Co0.9Cu0.1)4.8 ribbons prepared with a wheel speed of 50 m/s exhibit a high coercivity of 52.7 kOe. Detailed magnetic studies like I and II quadrant magnetization-demagnetization characteristics, minor-loop measurement with increasing field and recoil behaviour have been carried out in combination with TEM studies. Fine spots of size ∼3 nm having different crystallographic orientations within the grains have been observed, and the high coercivity of the sample is attributed to complex domain wall interactions with the fine grain (∼55 nm) microstructure containing nanoscale heterogeneities.

Calcium vapor synthesis of extremely coercive SmCo5

“…Note that decreasing coercivity correlates with increasing maximum magnetization, as the applied field is able to reverse more of the sample. The molded part compares favorably with the best reports from other production methods including plasma spraying, 35 melt spinning, 36 and mechanical alloying. 33,37 Coercivity and remanence values are compared with literature and industry (data from Arnold Magnetic Technologies provides representative commercial values 38 ) reports of isotropic Sm–Co in Fig.…”

“…Reports of high coercivities have credited domain wall pinning on stacking faults, 42 Sm rich inclusions, 42 or grain boundaries. 36,42 Virgin magnetization curves for our samples (Fig. S1 † ) demonstrate that the limiting factor in magnetic reversal remains nucleation.…”

“…33,37 Coercivity and remanence values are compared with literature and industry (data from Arnold Magnetic Technologies provides representative commercial values 38 ) reports of isotropic Sm-Co in Fig. 3b, 33,36,37 a more detailed gure and references for the points therein is presented in Fig. S4 and table S1.…”

Effect of Solidification Process on the Magnetic Properties of Samarium Cobalt Intermetallic Compounds

“…These magnets have a good potential in rapidly developing fields such as aerospace technology where high temperature stable magnetic materials are in demand. In this class of magnets, SmCo 5 is comparatively simple alloying system, which demonstrates the largest magnetocrystalline anisotropy as mentioned by S. Kopoju et al 1) among the rare-earth transition metal alloys. Further, B.D.…”

Selecting Doping Elements by Data Mining for Advanced Magnets

“…In this respect, we spent over 10 years building up a specific database for Sm-Co systems, which contains both experimental and computational data for ∼1050 alloys published in the literature for decades, and some of them are used as references in this work. − ,,,− More importantly, we embedded in the database the related information search regarding composition, processing, microstructure, properties, and references of the material, which is unique from other material databases. The above specialized database may be considered as a “Materials Genome Initiative (MGI) , database of Sm-Co materials” according to its characteristics.…”