Many-spin effects and tunneling properties of magnetic molecules

Journal Article · Mon May 01 00:00:00 EDT 2000 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.372675· OSTI ID:20216267

Al-Saqer, M ^[1]; Dobrovitski, V V ^[1]; Harmon, B N ^[1]; Katsnelson, M I ^[1]

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1. Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)

Spin tunneling in molecular magnets has attracted much attention, however theoretical considerations of this phenomenon up to now have not taken into account the many-spin nature of molecular magnets. We present, to our knowledge, the first successful attempt of a realistic calculation of tunneling splittings for Mn{sub 12} molecules, thus achieving a quantitatively accurate many-spin description of a real molecular magnet in the energy interval ranging from about 100 K down to 10{sup -12} K. Comparison with the results of the standard single-spin model shows that many-spin effects affect the tunneling splittings considerably. The values of ground state splitting given by single-spin and many-spin models differ from each other by a factor of 5. (c) 2000 American Institute of Physics.

• OSTI ID: 20216267
• Journal Information: Journal of Applied Physics, Vol. 87, Issue 9; Other Information: PBD: 1 May 2000; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
MOLECULES
MANGANESE
TUNNEL EFFECT
MAGNETS
SPIN
TEMPERATURE RANGE
THEORETICAL DATA