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We examine the interplay between anisotropy of the in-plane magnetization andthe nodal gap structure on the basis of the approximate analytic solution inthe quasiclassical formalism. We show that a four-fold oscillation appears inthe magnetization, and its amplitude changes sign at an intermediate field. Thehigh-field oscillation originates from the anisotropy of the upper criticalfield, while the low-field behavior can be understood by the thermallyactivated quasiparticles near nodes depending on the applied field angles. Thetemperature dependence of the magnetization also shows a similar sign change.The anisotropy of the magnetization offers a possible measurement to identifythe gap structure directly for a wide class of type II superconductors.Comment: 4 pages, 4 figure

Anisotropy of In-Plane Magnetization Due to Nodal Gap Structure in Vortex State