Magnetic properties of mechanically-alloyed Sm-Co nanophase hard magnets

High-temperature magnetic properties of mechanically alloyed SmCo 5 and YCo5 magnets

The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo5 (R= Sm and Y) is studied. The annealed materials have the hexagonal CaCu5 structure with 2 : 17 (or 1 : 7) regions as a minor phase. High-temperature magnetic measurements show that the coercivities of materials decrease with increasing temperature from room-temperature to 873 K, but that the temperature coef...

Magnetic hysteresis of mechanically alloyed Smâ•fiCo nanocrystalline powders

Sintering Properties of Mechanically Alloyed Ti-5Al-2.5Fe

In this study, Ti-5Al-2.5Fe alloy was prepared by powder metallurgy. The elemental titanium, aluminum, and iron powders were mechanically alloyed for 10 h in a vacuum atmosphere. A stainless steel jar and stainless steel balls were used for mechanical alloying. The alloyed powders were then sintered by vacuum hot pressing at 950 °C for a soaking time of 30 minutes. Pure titanium was also sinter...

Magnetic hardening studies in sintered Sm„Co,Cux ,Fe,Zr...z 2:17 high temperature magnets

Lorentz microscopy combined with conventional transmission electron microscopy were used to image the magnetic domains and microstructures of sintered Sm~CobalCuxFe0.06Zr0.03)z ~0.088<x <0.128; 5.8<z<7.2! permanent magnets which were specifically designed for high temperature applications. The microstructural data were correlated with the magnetic measurements to understand the origin of coerci...

Magnetic noise in structured hard magnets.

The anomalous Hall effect of wires patterned from (Co{90}Fe{10}/Pt){n} multilayers, with 10<or=n<or=50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1/f noise appears in samples with a quality factor Q<1 at points on the hysteresis loop where the magnetization reverses continuously. The magnetic noise is associated with reversible excursions...