Inversion of the domain wall propagation in synthetic ferrimagnets

We report on magnetic domain wall velocity measurements in a synthetic ferrimagnet made of two perpendicular ferromagnetic layers antiferromagnetically exchange coupled. In this system, two types of transitions may be observed: one from a parallel alignment to an antiparallel alignment of the magnet...

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Bibliographic Details
Published in:Applied physics letters 2017-07, Vol.111 (2), p.22407-22407
Main Authors: Hamadeh, A., Pirro, P., Adam, J.-P., Lu, Y., Hehn, M., Petit Watelot, S., Mangin, S.
Format: Article
Language:English
Subjects:
Alignment
Antiferromagnetism
Applied physics
Condensed Matter
Domain propagation
Domain walls
Exchanging
Ferrimagnetism
Ferrimagnets
Ferromagnetism
Interlayers
Magnetic domains
Other
Physics
Propagation
Propagation velocity
Pulse amplitude
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Summary:We report on magnetic domain wall velocity measurements in a synthetic ferrimagnet made of two perpendicular ferromagnetic layers antiferromagnetically exchange coupled. In this system, two types of transitions may be observed: one from a parallel alignment to an antiparallel alignment of the magnetization of the two layers and the other between the two possible antiparallel alignments. Those transitions are shown to be dominated by domain wall propagation. The domain wall velocity as a function of the applied magnetic field pulse amplitude has been measured. Two remarkable features are observed: first, a drastic breakdown of the domain wall velocity and then an inversion of the domain propagation direction are observed when the field pulses reach values comparable to the exchange field between the two layers. This unexpected behavior can be understood qualitatively using a simple model taking into account the competition between interlayer exchange coupling and the external driving field.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4993604