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Volumn 80, Issue 22, 2009, Pages

Alignment of magnetic anisotropy axes in crystals of Mn12 acetate and Mn12 -tBuAc molecular nanomagnets: Angle-dependent ac susceptibility study

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EID: 77954717755     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.80.224428     Document Type: Article
Times cited : (9)

References (29)
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    • Oxford University Press, Oxford, 10.1093/acprof:oso/9780198567530.001. 0001
    • D. Gatteschi, R. Sessoli, and J. Villain, Molecular Nanomagnets (Oxford University Press, Oxford, 2006). 10.1093/acprof:oso/9780198567530.001.0001
    • (2006) Molecular Nanomagnets
    • Gatteschi, D.1    Sessoli, R.2    Villain, J.3
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    • 10.1103/PhysRev.57.426
    • J. H. Van Vleck, Phys. Rev. 57, 426 (1940). 10.1103/PhysRev.57.426
    • (1940) Phys. Rev. , vol.57 , pp. 426
    • Van Vleck, J.H.1
  • 26
    • 77954701825 scopus 로고    scopus 로고
    • In a mean-field approximation, kB θ= Hm g μB S (Ref.), where Hm = λm Ms is the mean field in a magnetically saturated state and Ms is the saturation magnetization. The approximation used is therefore equivalent to setting the typical dipolar field in the unpolarized state as equal to one half of the maximum Hm. The ratio between the interaction fields of the two compounds (two times larger for the acetate) determined from θ agrees, in fact, with the ratio 1.9 of their saturation magnetizations, which arises from the smaller unit-cell volume of Mn12 acetate (3.72 nm3 ) as compared with that of Mn12 -tBuAc (7.06 nm3 ). The same applies to the dipolar fields created by the two nearest-neighbor spins along the anisotropy axis, which amounts to 388 Oe for Mn12 acetate and 200 Oe for Mn12 -tBuAc.
    • In a mean-field approximation, k B θ = H m g μ B S (Ref.), where H m = λ m M s is the mean field in a magnetically saturated state and M s is the saturation magnetization. The approximation used is therefore equivalent to setting the typical dipolar field in the unpolarized state as equal to one half of the maximum H m. The ratio between the interaction fields of the two compounds (two times larger for the acetate) determined from θ agrees, in fact, with the ratio 1.9 of their saturation magnetizations, which arises from the smaller unit-cell volume of Mn 12 acetate (3.72 nm 3) as compared with that of Mn 12 -tBuAc (7.06 nm 3). The same applies to the dipolar fields created by the two nearest-neighbor spins along the anisotropy axis, which amounts to 388 Oe for Mn 12 acetate and 200 Oe for Mn 12 -tBuAc.


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