Magnetic Order and Coupling Phenomena: A Study of Magnetic by Christian Schubert

By Christian Schubert

This thesis offers fresh advancements in magnetic coupling phenomena of ferrimagnetic rare-earth transition-metal Tb-Fe alloys and matched structures along with ferri-/ferromagnetic heterostructures. making the most of the tunability of the alternate coupling among ferrimagnetic and ferromagnetic layers by way of stoichiometry of the Tb-Fe layer, the variable variety of repetitions within the Co/Pt multilayer in addition to the thickness of an interlayer spacer, it's verified that giant perpendicular unidirectional anisotropy will be prompted at room temperature. This strong perpendicular trade bias at room temperature opens up a direction in the direction of purposes in spintronics.

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Extra resources for Magnetic Order and Coupling Phenomena: A Study of Magnetic Structure and Magnetization Reversal Processes in Rare-Earth-Transition-Metal Based Alloys and Heterostructures

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The quantization axis and with it the number of unoccupied spin-up and spin-down states depend on the orientation of the magnetization in the material. In particular the alignment of the magnetization parallel or antiparallel to the photon spin direction leads to a maximum or minimum transition probability for the polarized photoelectrons and therefore the X-ray absorption. The different absorption abilities are denoted with the absorption coefficient for right and left circularly polarized light μ+ (E) and μ− (E), respectively.

Y. Mimura, N. Imamura, T. Kobayash, A. Okada, Y. Kushiro, J. Appl. Phys. 49, 1208 (1978) 25. R. Van Dover, M. Hong, E. Gyorgy, J. Dillon, S. Albiston, J. Appl. Phys. 57, 3897 (1985) 26. R. Malmhäll, T. Chen, Thin Solid Films 125, 257 (1985) References 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 17 A. Clark, H. Belson, Phys. Rev. B 5, 3642 (1972) M. Kryder, Ann. Rev. Mater. Sci. 23, 411 (1993) Y. Aoki, IEEE Trans. Magn. MAG-20, 1022 (1984) S. Tsunashima, J. Phys. D: Appl. Phys. 34, R87 (2001) J.

06×10−3 this Laves phases possess a very strong influence of the magnetic field on the structure. However, this alloys exhibit also strong magnetocrystalline anisotropy making them unsuited for magnetoelastic applications due to the high saturation fields they require. Therefore, extensive research was done concerning amorphous rare-earth-transitionmetal alloys [9]. Since the magnetostrictive effects in this amorphous materials are related to magnetoelastic interactions between local strains and anisotropies controlling the direction of magnetic moment, relatively high magnetostriction constants with moderate magnetic anisotropies are possible already at RT [4].

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