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Journal Articles

Magnetic structure of spin-density waves in Cr(001)/Sn multilayers with periodic monatomic spacer layers of nonmagnetic Sn

Takeda, Masayasu; Mibu, Ko*; Shinjo, Teruya*; Endo, Yasuo*; Suzuki, Junichi

Physical Review B, 70(10), p.104408_1 - 104408_9, 2004/09

 Times Cited Count:8 Percentile:42.35(Materials Science, Multidisciplinary)

Detailed magnetic structure of spin-density waves (SDWs) in epitaxial Cr(001)/Sn multilayer was investigated by neutron scattering combined with M$"o$ssbauer spectroscopic studies. Monatomic Sn layers were embedded in 240 nm thick Cr(001) films with varying the periodic spacing from 4.2 to 16.2 nm. All samples were revealed to be a commensurate antiferromagnetic (CAF) phase at 300 K. The CAF structures changed to incommensurate SDW states with complex waveforms whose wavelength are controlled by the artificial periodicity at low temperatures although the CAF structure in the sample with the period of 4.2 nm persisted even at 10 K. The phase transition depends on the thickness of the Cr layers intervening between Sn monatomic layers. An appreciable phase slip in the SDW was observed during the phase transition in the sample with the period of 10.2 nm. The SDW structure is discussed by taking account of the competing forces between the nesting of Fermi surface and a pinning of antinodes at the Sn monatomic layers.

Journal Articles

Growth-orientation dependence of magnetic properties of Cr-based multilayers with $$^{119}$$Sn monatomioc layers

Jiko, Norihiro*; Almokhtar, M.*; Takeda, Masayasu; Suzuki, Junichi; Shinjo, Teruya*; Mibu, Ko*

Journal of Magnetism and Magnetic Materials, 272-276(Part2), p.1233 - 1234, 2004/05

The growth-orientation dependence of magnetism of Cr/Sn and Fe/Cr/Sn/Cr multilayers was studied. For Fe/Cr/Sn/Cr multilayers, reduction of Cr magnetic moments was found in both (011)- and (001)-orientated samples, and the effect is larger in the former than the latter. In Cr/Sn multilayers, the (011)-oriented sample with the Cr layer thickness (${it t}$$$_{Cr}$$$$geq$$) of 80$AA  has a commensurate antiferromagnetic structure, while the (001)-oriented samples with {it t}$$$_{Cr}$$$$geq$$ 80AA have a spin-density-wave structure with the wave vector perpendicular to the film plane.

Journal Articles

XAFS study on RbC$$_{60}$$

Kubozono, Yoshihiro*; Mimura, Kazue*; Takabayashi, Yasuhiro*; Maeda, Hironobu*; Kashino, Setsuo*; Emura, Shuichi*; Nishihata, Yasuo; Uruga, Tomoya*; Tanaka, Tsunehiro*; Takahashi, Masao*

Journal of Synchrotron Radiation, 6(Part3), p.564 - 566, 1999/05

The Rb K-edge XAFS spectra for the stable phase of RbC60 which is a quasi one-dimensional polymer were measured in the temperature range from 14.6 to 210 K in order to clarify the origin of the metal-insulator transition around 50 K. The distances and mean-square relative displacements between the Rb atom and the neighboring C atoms determined by XAFS exhibited no change around 50 K, implying that the metal-insulator transition originates from the SDW instablity.

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