Abstract
The microstructure, crystal structure, and magnetic properties were studied for (Nd,Tb)2Fe14B nanoflakes prepared by surfactant-assisted high-energy ball milling (HEBM). Effects of ball-milling time on the c-axis crystallographic alignment, morphology, and magnetic properties of (Nd,Tb)2Fe14B nanoflakes were systematically investigated. X-ray diffraction (XRD) results indicate that the average crystal grain size of the nanoflakes decreases from 60 nm of 1 hour milling to 33 nm of 7 hours milling. The nanoflakes milled for 3 hours bear an average thickness of 100 nm and an average diameter of 2 μm leading to a high aspect ratio of 20. In addition, the intensity ratio of I(006)/I(105) indicates that the degree of c-axis crystal texture increases first, peaks for 3 hours, then drops with increasing the milling time. Meanwhile, the coercivity (Hc) of the nanoflakes drops monotonically. The remanence (Mr) of nanoflakes milled for 3 hours in the easy axis direction is 11 kG, while the Mr in the hard axis direction is 1.8 kG, indicating a strong magnetic anisotropy. The optimal magnetic properties of Mr of 11 kG, and Hc of 7 kOe, (BH)max of 24.7 MGOe have been achieved.
Highlights
A variety of rare earth (RE)-transition metal (TM) nanoparticles and nanoflakes with high aspect-ratio were prepared by a surfactant-assisted ball milling (SABM) method.[5,6,7]
We reported the preparation and characterization of anisotropic (Nd,Tb)2Fe14B nanoflakes fabricated by surfactant-assisted high energy ball milling
Strong-textured (Nd,Tb)2Fe14B nanoflakes were successfully produced, and the effect of ball milling time on the structure and magnetic properties of the flakes were systematically investigated. (Nd,Tb)2Fe14B nanoflakes milled for 3 hours show an optimal magnetic properties of Ms of 11.5 kG, monotonically. The remanence (Mr) of 11 kG, Hc of 7 kOe, and (BH)max of 24.7 MGOe
Summary
The rare earth permanent magnetic nanoparticles and nanoflakes have drawn tremendous attention due to their unique morphology and good potential in practical applications.[1,2,3,4] A variety of rare earth (RE)-transition metal (TM) nanoparticles and nanoflakes with high aspect-ratio were prepared by a surfactant-assisted ball milling (SABM) method.[5,6,7] Up to now, remarkable progress has been reported in preparation of Nd2Fe14B based nanoparticles and nanoflakes with low coercivity not more than 2 kOe.[1,5,8] For comparison, the as-prepared Tb2Fe14B based nanoparticles and nanoflakes possess high room temperature coercivity more than 20 kOe and strong magnetic anisotropy.[9]. We reported the preparation and characterization of anisotropic (Nd,Tb)2Fe14B nanoflakes fabricated by surfactant-assisted high energy ball milling. Strong-textured (Nd,Tb)2Fe14B nanoflakes were successfully produced, and the effect of ball milling time on the structure and magnetic properties of the flakes were systematically investigated. (Nd,Tb)2Fe14B nanoflakes milled for 3 hours show an optimal magnetic properties of Ms of 11.5 kG, Mr of 11 kG, Hc of 7 kOe, and (BH)max of 24.7 MGOe
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