Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.167202
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Funding
- U.S. DOE (Division of Materials Sciences and Engineering, Office of Basic Energy Sciences)
- CMSN
- U.S. NSF [DMR-0906025]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906025] Funding Source: National Science Foundation
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Using in situ magneto-optical Kerr effect measurements and phenomenological modeling, we study the tunability in both the magnetization anisotropy and magnetic coupling of Fe nanodots on a curved Cu(111) substrate with varying vicinity. We observe that, as the terrace width w decreases, the magnetization anisotropy increases monotonically, faster when w is smaller than the nanodot size d. In contrast, the magnetic coupling strength also increases until w similar to d, after which it decreases steeply. These striking observations can be rationalized by invoking the counterintuitive dimensionality variation of the surface electrons mediating the interdot coupling: the electrons are confined to be one dimensional (1D) when w >= d, but become quasi-2D when w < d due to enhanced electron spillover across the steps bridged by the nanodots.
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