Cluster-Expansion Model for Complex Quinary Alloys: Application to Alnico Permanent Magnets

Cluster-Assembled Iron-Platinum Nanocomposite Permanent Magnets

Exchange-spring nanocomposite permanent magnets have received a great deal of attention for their potential for improved the energy products. Predicted results, however, has been elusive. Optimal properties rely on a uniformly fine nanostructure. Particularly, the soft magnetic phase must be below approximately 10 nm to ensure complete exchange coupling. Inert gas condensation (IGC) is an ideal...

Mixed-basis cluster expansion for thermodynamics of bcc alloys

To predict the ground-state structures and finite-temperature properties of an alloy, the total energies of many different atomic configurations s;hsi ; i=1, . . . ,Nj, with N sites i occupied by atom A ssi=−1d, or B ssi = +1d, must be calculated accurately and rapidly. Direct local-density approximation (LDA) calculations provide the required accuracy, but are not practical because they are li...

Coercivity Enhancement and Gamma Phase Avoidance of Alnico Alloys

The promotion of social progress requires greater levels of energy efficiency, quality and productivity. However, these developments usually come at the cost of the environment. Green technologies such as electric vehicles, wind turbine and solar panels are ironically overshadowed by supply limitations and high prices of rare earth elements. Therefore, it is important to find alternative materi...

Magnetic Cluster Expansion Model for High-Temperature Magnetic Properties of Iron and Iron-Chromium alloys

Application of PLD-Fabricated Thick-Film Permanent Magnets

Isotropic Nd-Fe-B thick-film magnets have been prepared using a pulsed laser deposition (PLD) method with the control of laser energy density (LED) followed by post-annealing. The characteristics of the method are a high deposition rate up to several tens of microns per hour together with a reliability of magnetic properties due to the good transfer of composition from an Nd-Fe-B target to a fi...