Magnetic anisotropy, tunneling effects, high-frequency EPR, and molecular structure of fast-relaxation species of Mn12

Keiji Takeda, Kunio Awaga, Tamotsu Inabe, Akira Yamaguchi, Hidehiko Ishimoto, Takahiro Tomita, Hiroyuki Mitamura, Tsuneaki Goto, Nobuo Môri, Hiroyuki Nojiri

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The crystals of a Mn12 cluster [Mn12O12(O2 CC6H5)16(H2O)4] ·2C6H5CO2H are mosaic, at least from the magnetic point of view, involving two kinds of molecules with different relaxation rates. The ratios of the two components in the crystals are strongly batch dependent. We characterize the two by comparing the magnetic properties of two batches in which the ratios are very different. The angular dependence of the magnetic properties indicates that the magnetic easy axis of the slow relaxation molecule is parallel to the molecular axis, while that of the fast relaxation (FR) molecule is tilted by 12°. The high-frequency electron paramagnetic resonance for the FR molecule supports the tilted easy axis and suggests an anisotropy even in its hard plane. The x-ray analyses demonstrate that the FR molecule involves a Mn3+ site with an unusual distortion.

Original languageEnglish
Article number094424
Pages (from-to)944241-9442412
Number of pages8498172
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number9
Publication statusPublished - 2002 Mar 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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