Bridging the gap between micromagnetism and ab initio calculations: basic hysteretic properties of CoPt-type magnets

We demonstrate how first-principles, microstructural and microscopic model calculations may be combined to obtain material-specific input for micromagnetic calculations. We elucidate the generic links between microstructural features and coercivity of polytwinned CoPt-type magnets. It is shown with...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 258; pp. 244 - 247
Main Authors Belashchenko, K.D., Antropov, V.P.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2003
Subjects
CoPt-type magnets
Magnetization reversal
Multiscale modeling
Magnetization reversal
Multiscale modeling
CoPt-type magnets
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Summary:We demonstrate how first-principles, microstructural and microscopic model calculations may be combined to obtain material-specific input for micromagnetic calculations. We elucidate the generic links between microstructural features and coercivity of polytwinned CoPt-type magnets. It is shown with the help of ab initio calculations that domain walls in these alloys are strongly attracted to antiphase boundaries, and, using microscopic simulations, that at twin boundaries they are split in magnetostatically coupled segments. We predict a peculiar mechanism of magnetization reversal via DW splitting in ‘partial walls’. General features of magnetization reversal are explained and estimates of coercivity given for the strong and weak pinning cases.
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ISSN:0304-8853
DOI:10.1016/S0304-8853(02)01028-4