2014/11/30 by Denis D. Sheka, Volodymyr P. Kravchuk, Yuri Gaididei · 2 citations
Biochemistry, Genetics and Molecular Biology · Engineering · Mathematics · Physics and Astronomy · #Anisotropy #Characterization and Applications of Magnetic Nanoparticles #Classical mechanics #Condensed matter physics #Curvature #Dipole #Ferromagnetism #Geomagnetism and Paleomagnetism Studies #Geometry #Magnet #Magnetic anisotropy #Magnetic dipole #Magnetic field #Magnetic properties of thin films #Magnetization #Magnetization dynamics #Mathematics #Physics #Quantum mechanics #Spin wave #Statics #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1088/1751-8113/48/12/125202
published as J. Phys. A: Math. Theor., vol. 48 (2015) 125202 · LaTeX, 17 pages, 3 figures
arxiv created 2015/01/27 · openalex publication_date 2015/03/02 · arxiv updated 2015/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We develop an approach to treat magnetic energy of a ferromagnet for arbitrary curved wires and shells on the assumption that the anisotropy contribution greatly exceeds the dipolar and other weak interactions. We show that the curvature induces two effective magnetic interactions: effective magnetic anisotropy and an effective Dzyaloshinskii-like interaction. We derive an equation of magnetization dynamics and propose a general static solution for the limit case of strong anisotropy. To illustrate our approach, we consider the magnetization structure in a ring wire and a cone surface: ground states in both systems essentially depend on the curvature, excluding strictly tangential solutions for a cone surface even in the case of strong anisotropy. We derive also the spectrum of spin waves in such systems.