Rapid thermal processing of magnetic materials

Abstract

The rapid thermal processing (RTP) technique features dynamic control of temperature, which permits high heating and cooling rates that cannot be reached with conventional furnace treatments. In recent years, RTP has been increasingly applied to the processing of magnetic materials. The controllable heating profiles provide an approach for the deliberate construction of materials structure via expediting phase transitions and tailoring materials morphology. In this review, the history, principles and facilities of several types of RTP techniques are introduced, including laser and electron beam heating, lamp heating, Joule heating and pulse thermal processing techniques. RTP of various advanced magnetic materials are reviewed, including soft magnetic materials, spintronic materials, magnetic recording materials and nanocomposite hard magnetic materials. Advantages of RTP are highlighted and compared with conventional thermal treatments.

Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent magnets

“…[14][15][16] Fig. 1 shows the influence of rapid thermal annealing temperature and time on (BH) max , σ max and µ 0 H c at room temperature.…”

The effect of sol–gel preparation conditions on structural characteristics and magnetic properties of M-type barium hexaferrite thin films

“…hkl) reflections on diffractograms of non-textured and textured BHF films, respectively. The films' texture can be affected by many factors, such as processing conditions or substrate nature [35][36][37][38][39][40][41]. As follows from Fig.…”

Pulsed laser deposition and annealing of Dy–Fe–B thin films on melt-spun Nd–Fe–B ribbons for improved magnetic performance

“…This is quite unexpected because it was reported that rapid thermal annealing (RTA) techniques involving laser, electron beam, and electric pulse heating are capable of heating rates up to several hundreds of degrees per second and also of high cooling rates that can be utilized to prepare ultra-fine nanocrystalline magnetic materials through the process of dynamic crystallization. High heating rate is demonstrated to improve crystallization of amorphous phases, phase transitions, grain size reduction, grain isolation and crystallographic texture [18]. RTA has been successfully applied to the processing of exchangecoupled hard magnetic nanocomposites with improved properties, including higher remanence, larger coercivity, and maximum energy products [19][20][21][22][23][24][25].…”