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Magnetic properties of YCo5 (70%wt)+Y2Co17 (30%wt) nanocomposite powders at low temperatures |
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| Authors: | JT Elizalde-Galindo FJ Rivera Gmez JA Matutes-Aquino CE Botez |
| Institution: | aDepartamento de Ciencias Básicas, Instituto de Ingeniería y Tecnología, Universidad Autónoma de Ciudad Juárez, Av. Del Charro #460 norte, Cd. Juárez, Chihuahua 32310, Mexico bDepartment of Physics, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, USA cCentro de Investigación en Materiales Avanzados, S.C., Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31120, Mexico |
| Abstract: | Nanostructured YCo5 (70%wt)+Y2Co17 (30%wt) composite powders were prepared by mechanical milling and subsequent annealing at 1073 K for 1.5 min. The average grain size  D of the YCo5 and Y2Co17 phases, obtained from XRD data, was 14 and 12 nm, respectively. The temperature dependence of the magnetic properties was studied by DC magnetization measurements at temperatures T ranging from 3 to 300 K. Hysteresis loops (Hmax=70 kOe) show that both the coercivity HC and the squareness σr/σmax are temperature-dependent. The coercivity increases from 12 kOe at room temperature to 18 kOe at T=3 K. The observed enhanced remanence (σr/σmax>0.5) indicates that a strong exchange coupling is present at all temperatures used in this study. The maximum magnetization σmax changes little with temperature and has a value of about 70% of the effective saturation magnetization of the title compound. |
| Keywords: | Nanocrystalline material Hard magnet Nanostructured magnet High coercivity Permanent magnet |
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