Atomically Assembled Quantum Spin Lattices Sander Otte
Atomically Assembled Quantum Spin Lattices Sander Otte
Atomically Assembled Quantum Spin Lattices Sander Otte
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Magnetic Anisotropy<br />
Magnetic field along nitrogen direction<br />
Magnetic field along vacancy direction<br />
Magnetic field along vacancy direction<br />
Ĥ = gµ B B · Ŝ + DŜ2 z + E<br />
⇣Ŝ2 x Ŝ 2 y<br />
⌘<br />
For Fe: S = 2, D = −1.55 meV, E = 0.31 meV, g = 2.11<br />
D < 0 means easy-axis anisotropy<br />
0<br />
• <strong>Spin</strong> prefers the z-axis for magnetization<br />
1 -1<br />
• Ground state has large |m z |<br />
2<br />
-2<br />
along nitrogen direction <br />
D > 0 means hard-axis anisotropy<br />
2<br />
-2<br />
• <strong>Spin</strong> dislikes the z-axis for magnetization<br />
1 -1<br />
• Ground state has small |m z |<br />
0<br />
Hirjibehedin et al. Science 317, 1199 (2007)<br />
© 2012 <strong>Sander</strong> <strong>Otte</strong> http://ottelab.tudelft.nl
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