Abstract
Sm1-xPrxCo5 (x=0-0.6) nanoflakes with CaCu5 structure were successfully prepared by surfactant-assisted high-energy ball milling (SAHEBM). The crystal structure and magnetic properties of Sm1-xPrxCo5 (x=0-0.6) nanoflakes were studied by X-ray diffraction and vibrating sample magnetometer. Effects of Pr addition on the structure, magnetic properties and coercivity mechanism of Sm1-xPrxCo5 nanoflakes were systematically investigated. XRD results show that all the nanoflakes have a hexagonal CaCu5-type (Sm, Pr)1Co5 main phase and the (Sm, Pr)2Co7 impurity phase, and all of the samples exhibit a strong (00l) texture after magnetic alignment. As the Pr content increases, remanence firstly increases, then slightly reduced, while anisotropy field (HA) and Hci of decrease monotonically. Maximum energy product [(BH)max] of the flakes increases first, peaks at 24.4 MGOe with Pr content of x = 0.4, then drops again. Magnetization behavior analysis indicate that the coercivity mechanism is mainly controlled by inhomogeneous domain wall pinning, and the pinning strength weakens with the increased Pr content, suggesting the great influence of HA on the coercivity of flakes.
Highlights
Rare-earth containing nanoflakes fabricated by surfactant-assisted ball milling (SABM) have received considerable interests due to their unique morphology, high roomtemperature magnetic properties, strong (00l) texture, and good potential in practical applications.[1,2,3,4] More recently, there have been many reports on the magnetic properties of magnetically anisotropic SmCo5 and PrCo5 nanoflakes fabricated by surfactant-assisted ball milling
Sm1-xPrxCo5 (x=0-0.6) nanoflakes with CaCu5 structure were successfully prepared by surfactant-assisted high-energy ball milling (SAHEBM)
Magnetization behavior analysis indicate that the coercivity mechanism is mainly controlled by inhomogeneous domain wall pinning, and the pinning strength weakens with the increased Pr content, suggesting the great influence of HA on the coercivity of flakes
Summary
Rare-earth containing nanoflakes fabricated by surfactant-assisted ball milling (SABM) have received considerable interests due to their unique morphology, high roomtemperature magnetic properties, strong (00l) texture, and good potential in practical applications.[1,2,3,4] More recently, there have been many reports on the magnetic properties of magnetically anisotropic SmCo5 and PrCo5 nanoflakes fabricated by surfactant-assisted ball milling. Ternary based Sm1-xHRExCo5 (HRE: heavy rare earth, including Dy, Tb, Gd, etc.)[5,6,7] compounds were developed by many researchers to improve the properties of the SmCo5. It is expected that the combination of SmCo5 and PrCo5 with proper composition may improve the Ms of the binary SmCo5 compounds at the cost of moderate decrease of HA at the same time in order to obtain optimal intrinsic magnetic property. Effects of Pr addition on the structure, magnetic properties, and coercivity mechanism of Sm1-xPrxCo5 nanoflakes were investigated. Magnetization behavior analysis on the flakes indicates that the coercivity mechanism is mainly controlled by inhomogeneous domain wall pinning
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