Year: 2019
Type: article
Abstract: We theoretically investigate the magnetic activation energy of permanent magnets. Practically, it is widely used in a phenomenological form as B ( H ext ) = B 0 1 − H ext / H 0 n , where B 0 is the activation energy in the absence of an external magnetic field H ext , n is a real parameter, and H 0 is defined by the equation B ( H 0 ) = 0 . We derive the general and direct expressions for these phenomenological parameters under the restriction of uniform rotation of magnetization and on the basis of the perturbative theory with respect to H ext . Further, we apply our results to Nd 2 Fe 14 B magnets and confirm the validity of the proposed method by comparing with the Monte Carlo calculations.
Authors: Daisuke Miura, Akimasa Sakuma
Institution: Tohoku University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Awards: Theoretical Study on Crystalline Magnetic Anisotropy and Gilbert Damping in Finite Temperature, Establishment of the new method for material synthesis utilizing light elements and their expansion to develop rare-earth-free magnet, Synthesis and magnetic properties of multi-element iron nitride nanoparticles by controll of site selectivity and degree of order, Microscopic study on the Gilbert damping constant for the inhomogeneous spin synamics, Synthesis of high saturation magnetization Fe nano soft magnetic nanoparticles with interstitial solid solution of Carbon and Oxygen
OpenAlex ID: W2904128472