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up to 30T稲見 俊哉; 大和田 謙二; 松田 康弘*; Ouyang, Z. W.*; 野尻 浩之*; 松村 武*; 奥山 大輔*; 村上 洋一*
Journal of Physics; Conference Series, 211, p.012010_1 - 012010_6, 2010/02
被引用回数：3 パーセンタイル：76.25Quite recently, successive metamagnetic transitions between 16T and 28T were reported on the rare-earth tetraboride TbB. Considerable attentions have been attracted on this peculiar behavior. Recently, X-ray diffraction experiments under pulsed high magnetic field have been developed at several places. In order to examine the magnetic structures at high magnetic fields, we applied this technique to TbB. Small magnetic X-ray scattering cross section was overcome by utilizing resonance enhancement. The obtained field, polarization, and scattering angle dependence of magnetic reflections indicates that magnetic moments perpendicular to the magnetic field exist in the high-field plateau phases. This result is inconsistent with normal fractional magnetization plateau phases that posses only magnetic moments parallel or antiparallel to the field. In order to resolve this discrepancy, we propose magnetic structures that consist of Ising spins and XY spins.
Ga
O
寺田 典樹*; 中島 多朗*; 満田 節生*; 松田 雅昌; 加倉井 和久; 田中 義人*; 北澤 英明*
Journal of Physics; Conference Series, 211(1), p.012005_1 - 012005_6, 2010/01
被引用回数：2 パーセンタイル：67.41Detailed magnetic structure in the ferroelectric phase of CuFeGaO has been recently determined to be proper helical structure with the ellipcity of 
0.9 by the comprehensive neutron diffraction study. In the present study, we have investigated the lattice modulation associated with the elliptical magnetic structure, using resonant X-ray diffraction measurements on CuFe
Ga
O. We observed the superlattice reflection indexed as (0, 1+2
, 0), where is the wave number of the magnetic modulation. The energy spectrum near the Fe-
absorption edge for the superlattice peak intensity conforms with that for the fundamental (0, 2, 0) intensity, suggesting that the superlattice modulation is at least associated with the displacements of the Fe ions, The origin of the superlattice modulation is discussed within the exchange-striction model.
武田 全康; 山崎 大; 平野 辰巳*
no journal, ,
磁気記録ハードディスクの読み取りヘッド用に開発された磁気多層膜の界面磁気構造は、その磁気構造がデバイス性能に大きく影響を与えるため、読み取りヘッドのさらなる高性能化,高信頼性を得るために必要不可欠な情報である。X線及び中性子を使った反射率法は、そのような界面構造を非破壊的に調べることのできる強力な測定手段である。本講演では、実験室にある典型的なX線反射率計と、最近、日本原子力研究開発機構の研究用原子炉JRR-3のビームホールに設置された偏極中性子反射率計、SUIRENを使った、磁気読み取りヘッド用に開発された磁性多層膜の磁気構造解析例について紹介する。
