Pielmeier, Florian and Giessibl, Franz J. (2013) Spin Resolution and Evidence for Superexchange on NiO(001) Observed by Force Microscopy. PHYSICAL REVIEW LETTERS, 110 (26): UNSP 26610. ISSN 0031-9007,
Full text not available from this repository. (Request a copy)Abstract
The spin order of the nickel oxide (001) surface is resolved, employing noncontact atomic force microscopy at 4.4 K using bulk Fe and SmCo tips mounted on a qPlus sensor that oscillates at sub-50 pm amplitudes. The spin-dependent signal is hardly detectable with Fe tips. In contrast, SmCo tips yield a height contrast of 1.35 pm for Ni ions with opposite spins. SmCo tips even show a small height contrast on the O atoms of 0.5 pm within the 2 x 1 spin unit cell, pointing to the observation of superexchange. We attribute the increased signal-to-noise ratio to the increased magnetocrystalline anisotropy energy of SmCo, which stabilizes the magnetic moment at the apex. Atomic force spectroscopy on the Ni up arrow, Ni down arrow, and O lattice site reveals a magnitude of the exchange energy of merely 1 meV at the closest accessible distance with an exponential decay length of lambda(exe) = 18 pm.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ATOMIC-RESOLUTION; MAGNETIC-MOMENTS; SURFACE; NIO(100); IMAGES; TIP; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 11:44 |
| Last Modified: | 07 Apr 2020 11:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16493 |
Actions (login required)
 |
View Item |
