Journal of Applied Physics · 2014 · 15 citations · 7 references
Natural SciencesMaterials SciencePhysicsElectromagnetismMagnetic MaterialsNanotechnologyAntiferromagnetismFerromagnetic MaterialsFerromagnetismMagnetic Thin FilmsMagnetism In SolidsSpintronicsFringing FieldsMagnetic Tunnel JunctionsMagnetization In NanostructuresMagnetometer MeasurementsMicromagnetic ModelingMicromagnetic SimulationNanomagnetismShape
We show that by avoiding fringing fields from synthetic antiferromagnet (SAF) structures and by engineering the shape of free layers, one can compensate the parasitic bias fields and have an unbiased magnetic tunnel junction (MTJ) free layer as an output for nanomagnet logic. Vibrating sample magnetometer measurements are used to investigate the switching behavior of nanoscale free layers of a PtMn/CoFe/Ru/CoFeB/MgO/CoFeB in-plane MTJ structure. The CoFe/Ru/CoFeB SAF structure of the measured MTJ stack is implemented in a shared configuration to eliminate fringing fields. In the absence of fringing fields, we experimentally observe a ferromagnetic “orange-peel” coupling field of 21 Oe between the nanoscale free layers and shared fixed layer. Micromagnetic simulations are performed to optimize the amount of slant on the edge of the free layer that compensates the 21 Oe bias field.
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Measurement of the spin-transfer-torque vector in magnetic tunnel junctions
Jack C. Sankey, Yong‐Tao Cui, J. Z. Sun et al. · Nature Physics · 2007 · 648 citations · Full text