Structural, electronic, and magnetic properties of a Mn monolayer on W(110)
Autor(en): | Bode, M Heinze, S Kubetzka, A Pietzsch, O Hennefarth, M Getzlaff, M Wiesendanger, R Nie, X Bihlmayer, G Blugel, S |
Stichwörter: | 2-DIMENSIONAL ANTIFERROMAGNETISM; ATOMIC-SCALE; FE MONOLAYERS; FILMS; IDEAL MONOLAYER; IN-SITU; Materials Science; Materials Science, Multidisciplinary; METAL-SURFACE; Physics; Physics, Applied; Physics, Condensed Matter; SCANNING TUNNELING MICROSCOPE; SPECTROSCOPY; SURFACE-STATES | Erscheinungsdatum: | 2002 | Herausgeber: | AMER PHYSICAL SOC | Journal: | PHYSICAL REVIEW B | Volumen: | 66 | Ausgabe: | 1 | Zusammenfassung: | In this paper we establish a monolayer of Mn on W(110) as a model system for two-dimensional itinerant antiferromagnetism. Combining scanning tunneling microscopy (STM), low-energy electron diffraction, and ab initio calculations performed with the full-potential linearized augmented plane wave method we have studied the structural, electronic, and magnetic properties of a Mn monolayer on W(110). Our experimental results indicate that in spite of the huge tensile strain Mn grows pseudomorphically on W(110) up to a thickness of three monolayers. Intermixing between the Mn overlayer and the W substrate can be excluded. Using these structural data as a starting point for the ab initio calculations of one monolayer Mn on W(110) we conclude that (i) Mn is magnetic and exhibits a large magnetic moment of 3.32mu(B), (ii) the magnetic moments are arranged in a c(2x2) antiferromagnetic order, (iii) the easy axis of the magnetization is in plane and points along the [1 (1) over bar0] direction, i.e., the direction along the long side of the (110) surface unit cell with a magnetocrystalline anisotropy energy of 1.3-1.5 meV, and (iv) the Mn-W interlayer distance is 2.14 Angstrom. The calculated electronic structure of a Mn monolayer on W(110) is compared with experimental scanning tunneling spectroscopy results. Several aspects are in nice agreement, but one cannot unambiguously deduce the magnetic structure from such a comparison. The proposed two-dimensional antiferromagnetic ground state of a Mn monolayer on W(110) is directly verified by the use of spin-polarized STM (SP-STM) in the constant-current mode, and an in-plane easy magnetization axis could be confirmed using tips with different magnetization directions. We compare the measurements with theoretically determined SP-STM images calculated combining the Tersoff-Hamann model extended to SP-STM with the ab initio calculation, resulting in good agreement. |
ISSN: | 24699950 | DOI: | 10.1103/PhysRevB.66.014425 |
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geprüft am 15.05.2024