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However, the force gradients of the interactions responsible for atomic contrast and those causing domain contrast are orders of magnitude apart, ranging from up to 100 Nm−1 for atomic interactions down to 0.0001 Nm−1 for magnetic dipole interactions. Here, we show that this gap can be bridged with a qPlus sensor, with a stiffness of 1800 Nm−1 (optimized for atomic interaction), which is sensitive enough to measure millihertz frequency contrast caused by magnetic dipole–dipole interactions. Thus we have succeeded in establishing a sensing technique that performs scanning tunneling microscopy, atomic force microscopy and MFM with a single probe. ER - TY - JOUR AU - Binnig, G. AU - Rohrer, H. AU - Gerber, C. AU - Weibel, E. JF - Phys. Rev. Lett. PY - 1982/// VL - 49 SP - 57 EP - 61 DO - 10.1103/PhysRevLett.49.57 ER - TY - JOUR AU - Binnig, G. AU - Quate, C. F. AU - Gerber, C. JF - Phys. Rev. Lett. 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