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. Author manuscript; available in PMC: 2014 Feb 18.
Published in final edited form as: Phys Rev Lett. 2009 Sep 17;103(12):128101. doi: 10.1103/PhysRevLett.103.128101

Figure 2.

Figure 2

Calculated field gradient, force and energy profiles from a 1000 nm wide domain wall localized on a 40 nm thick, 1 μm wide FeCo wire. (a) Magnetic field gradients above the wire based on “point charge” (solid line) model and OOMMF simulations (dashed line) increase rapidly above 104 T/m as distance z to the domain wall decreases. (b) Variation of axial force Fz determined from “point charge' model on a magnetic bead (χ = 0.85) lying 1.42 μm above domain wall with external field Hz. (c)–(f) potential energy profiles transform from attractive (c, d, e) to repulsive (f) by changing Hz further negative. Calculated maximum force Fxmax along length of wire shows its tunability with Hz. Note for distances z >1300 nm relevant to this study, the magnetic energies are not sensitive to the precise magnetization profiles within the domain wall.