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Direct Observation of a Localized Magnetic Soliton in a Spin-Transfer Nanocontact
D Backes1, F Macià1,2, S Bonetti3,4
1Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA.
Abstract:
We report the direct observation of a localized magnetic soliton in a spin-transfer nanocontact using scanning transmission x-ray microscopy. Experiments are conducted on a lithographically defined 150 nm diameter nanocontact to an ultrathin ferromagnetic multilayer with perpendicular magnetic anisotropy. Element-resolved x-ray magnetic circular dichroism images show an abrupt onset of a magnetic soliton excitation localized beneath the nanocontact at a threshold current. However, the amplitude of the excitation ≃25° at the contact center is far less than that predicted (⪅180°), showing that the spin dynamics is not described by existing models.
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