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1

Development of a new micro-MOKE magnetometer combined with magnetic domain scope

Suzuki K., Ueno H., Takase T., Yamaguchi K.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 2b

28--31

EN

A measurement system was developed for observation of magnetic domains and micro-MOKE on same field of vision. The system is available for measuring B-H curve at a spot with micro-scale after a confirmation of magnetic domain patterns. The measurement system has a possibility to detect the magnetization process of locally agglutinated magnetic materials buried in non-magnetic materials.

PL

W artykule przedstawiono nowy magnetometr typu mikro-MOKE. Omawiany system ma możliwość pomiaru charakterystyki B-H w skali mikro przy ustalonej domenie magnetycznej oraz wykrywania procesu magnetyzacji w miejscowo sklejonych materiałach magnetycznych, zagrzebanych w materiałach niemagnetycznych.

2

Lie tensor product manifolds

Sato H., Yamaguchi K.

Demonstratio Mathematica

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2012

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Vol. 45, nr 4

909-927

EN

We study the geometric structures of parabolic geometries. A parabolic geometry is defined by a parabolic subgroup of a simple Lie group corresponding to a subset of the positive simple roots. We say that a parabolic geometry is fundamental if it is defined by a subset corresponding to a single simple root. In this paper we will be mainly concerned with such fundamental parabolic geometries. Fundamental geometries for the Lie algebra of (…) type are Grassmann structures. For (…) types, we investigate the geometric feature of the fundamental geometries modeled after the quotients of the real simple groups of split type by the parabolic subgroups. We name such geometries Lie tensor product structures. Especially, we call Lie tensor metric structure for (…) or (…) type and Lie tensor symplectic structure for (…) type. For each manifold with a Lie tensor product structure, we give a unique normal Cartan connection by the method due to Tanaka. Invariants of the structure are the curvatures of the connection.

3

The magnetoresistance of amorphous ribbon [Fe86Zr7Cu1B6]

Yamaguchi K., Ito M., Isozaki K., Yamada K., Grossinger R.

Journal of Technical Physics

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1998

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Vol. 39, no 3-4

647-654

EN

The temperature-depedence of resistivity and magnetoresistance for as-cast and annealed samples of amorphous thin ribbons of [Fe86Zr7Cu1B6] have been investigated trouugh the sample by Joule heating. The temperature coefficients of the resistivity show a large difference between the as-cast and Joule heated samples, the effect which originated by the nano-crystallizations. The observed negative magnetoresistance is proportional to the square of the magnetization. The s - d type exchange constant was estimated at J = 0.1 eV, the analysis being based on a model of the conduction carrier scattering by exchange interactions with differntly oriented spins in magnetic domain structures.