Electron backscattered diffraction texture analysis of SmCo5 magnets

Abstract

The remanence of sintered SmCo5 magnets is a direct function of their crystallographic texture. The Jr∕Js ratio was determined by electron backscattered diffraction (EBSD) for SmCo5 magnets which had been oriented in a pulsed field of 6T, compressed isostatically, and then sintered at 1150–1170°C for 1h. The experimentally determined EBSD distribution does not follow a Gaussian or a function of the form f(θ=cosnθ). EBSD measurements provided the same Jr∕Js value (0.91) as a microstructural model plus remanence measurements. X-ray diffraction Schulz pole figures resulted in a slightly higher Jr∕Js value (0.92), probably due to neglecting misaligned grains.

Study of obliquely deposited thin cobalt films

“…4, for the film 40 nm in thickness. To obtain a better insight into the crystallographic orientation of the films, it is necessary to apply more sensitive techniques, such as XRD -2 spectra [22,23], the X-ray Schulz pole figures [17,24] or the electron backscattered diffraction (EBSD) method [24].…”

Electron back scattered diffraction study of SmCo magnets

“…Previously [5], we used OIM-EBSD to discuss texture in well-oriented SmCo 5 magnets. In that case, good agreement was obtained for calculated values of J r /J s obtained from EBSD and XRD.…”

“…Samples of isotropic, sintered SmCo alloys with approximate composition SmCo 5 (bal ¼ balance) with x ¼ 0, 0.02, 0.04, 0.06, and 0.08 which had received a full thermal treatment to develop coercivity [6], as will be discussed later.…”

“…For smaller systems, electron back scattered diffraction (EBSD) can provide useful texture information. EBSD has been used to observe grain orientation in large-grained NdFeB [3,4] and well-ordered SmCo 5 [5] magnets. In the present paper, we discuss experimental conditions for performing EBSD measurements on rare-earth permanent magnets and test the limits of this technique on nanostructured Sm(CoFeCuZr) z magnets.…”

Predicting Recoil Curves in Stoner-Wohlfarth Anisotropic Magnets

“…In hard magnetic materials manufactured by powder metallurgy, as SmCo 5 [6,7], NdFeB [8], or SmCoFeCuZr [2], the particles are milled until they are a single crystal. Then there is a step of alignment of crystals under magnetic field.…”