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Bryant, B. (author), Spinelli, A. (author), Wagenaar, J.J.T. (author), Gerrits, M. (author), Otte, A.F. (author)Individual Fe atoms on a Cu2N/Cu(100) surface exhibit strong magnetic anisotropy due to the crystal field. We show that we can controllably enhance or reduce this anisotropy by adjusting the relative position of a second nearby Fe atom, with atomic precision, in a low-temperature scanning tunneling microscope. Local inelastic electron tunneling...journal article 2013