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Magnetic dimer at a surface: Influence of gravity and external magnetic fields.
The European Physical Journal E ( IF 1.8 ) Pub Date : 2020-07-09 , DOI: 10.1140/epje/i2020-11969-4 Ebenezer Kemgang 1 , Hervé Mohrbach 1 , René Messina 1
中文翻译:
表面的磁性二聚体:重力和外部磁场的影响。
更新日期:2020-07-09
The European Physical Journal E ( IF 1.8 ) Pub Date : 2020-07-09 , DOI: 10.1140/epje/i2020-11969-4 Ebenezer Kemgang 1 , Hervé Mohrbach 1 , René Messina 1
Affiliation
Abstract.
The interaction of two dipolar hard spheres near a surface and under the influence of gravity and external perpendicular magnetic fields is investigated theoretically. The full ground-state phase diagram as a function of gravity and magnetic field strengths is established. A dimer (i.e., two touching beads) can only exist when the gravity and magnetic field strengths are simultaneously not too large. Thereby, upon increasing the magnetic field strength, three dimeric states emerge: a lying state (dimer axis parallel to the substrate), an inclined state (intermediate state between the lying and standing ones) and a standing state (dimer axis normal to the substrate). It is found that the orientation angles of the dimer axis and the dipole moment in the newly discovered inclined phase are related by a strikingly simple Snell-Descartes-like law. We argue that our findings can be experimentally verified in colloidal and granular systems.Graphical abstract
中文翻译:
表面的磁性二聚体:重力和外部磁场的影响。