# Influence of Selected Transition Metals on Hard Magnetic Properties of Dy-Fe-Nb-B Vacuum Suction Rods

## TL;DR

This paper explores how adding small amounts of transition metals affects the magnetic properties of a specific alloy used in vacuum suction rods.

## Contribution

The study reveals how specific metal dopants enhance magnetic anisotropy and coercivity in Dy-Fe-Nb-B alloys.

## Key findings

- Adding 0.5 at.% Ni increased the anisotropy field from 5.2 T to 7.5 T.
- 0.5 at.% Pt increased the coercive field from 4.6 T to 5.5 T.
- Dopants improved microstructure regularity and reduced dendrite formation.

## Abstract

This study investigates the structural and magnetic properties of ultra-high coercivity (Fe80B14Nb6)0.88Dy0.12 alloys, doped with 0.5–5 at.% of selected metallic additions: magnetic (Ni, Co) and non-magnetic (Pt, Cu) elements. Material characterization involved both structural and magnetic measurements. Alloys containing dopant concentrations up to 2 at.% exhibited similar phase compositions, with the Dy2Fe14B compound being dominant. Magnetic hysteresis loops revealed a superposition of two components: magnetically soft and hard phases. A significant change in magnetic properties was observed within the 0.5 to 1 at.% dopant concentration range. Notably, the addition of 0.5 at.% Ni increased the apparent anisotropy field from 5.2 T to 7.5 T. Furthermore, 0.5 at.% Pt led to an increase in the coercive field from 4.6 T to 5.5 T. These additions influenced crystallization, resulting in the formation of a more regular microstructure without submicrometric dendrite branches, when compared to the base alloy.