Download Band-Ferromagnetism by K. Baberschke, M. Donath, W. Nolting PDF

By K. Baberschke, M. Donath, W. Nolting

The attention-grabbing phenomenon ferromagnetism is much from being totally understood, even though it absolutely belongs to the oldest difficulties of reliable kingdom physics. For any research it sounds as if recommendable to tell apart among fabrics whose spontaneous magnetization stems from localized electrons of ?lled atomic shell and people within which it truly is as a result of itinerant electrons of ?lled conduction band. within the latter case one speaks of band-ferromagnetism, prototypes of that are the classical ferromagnets Fe, Co, and Ni. the current publication is a standing document at the extraordinary growth that has lately been made in the direction of a microscopic figuring out of band-ferromagnetism as an electron c- relation e?ect. The authors of some of the chapters of this publication “Band-Ferromagnetism: Ground-State and Finite-Temperature Phenomena” participated as chosen - perts within the 242nd WE-Heraeus-Seminar (4-6 October 2000) held below nearly an identical name in Wandlitz close to Berlin (Germany). It used to be the second one seminar of this sort in Wandlitz. (The ?rst in 1998 handled the complementary subject of the physics of local-moment ferromagnets equivalent to Gd). Twenty-six invited spe- ers from ten di?erent international locations including ?fty-?ve extra contributors, who offered contributions in kind of posters, spent 3 days jointly discussing in an enthusiastic and fertile demeanour the new themes of band-ferromagnetism.

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We prefer to keep the orbital magnetism as what it is, originating from non-spherical charge distributions described by the orbital angular momentum, be it as orbital polarization or as spin-orbit coupling. (3) with an ‘effective anisotropic exchange’. The summation over all lattice sites i, j in cubic symmetry and infinite-sized samples vanishes. 1 (we ignore this in the following discussion). For finite-sized samples like ultrathin films two approaches are commonly used: • The continuum model assuming a dipole density: This leads to the wellknown demagnetizing factor N times the magnetization M 2 : E dip = 2π N ⊥ − N || M 2 (4) • The discrete lattice sum over point dipoles: Here a magnetic moment per lattice site is assumed and the summation (Madelung-sum) is taken over the whole specimen.

Ser. Notes 55, Inst. of Physics, Bristol, 1981), p. 1. 40. M. Donath, Surface Science Reports 20, 251 (1994). 41. -P. K¨ amper, W. Schmitt, and G. G¨ untherodt, Phys. Rev. B 42, 10696 (1990). 42. A. Mook, Phys. Rev. 148, 495 (1966). 43. R. Raue, H. Hopster, and R. Clanberg, Phys. Rev. Lett. 50, 1623 (1983). 44. S. Wang and J. Callaway, Phys. Rev. B 15, 298 (1977). 45. P. Wohlfahrt in Handbook of Magnetic Materials 1, ed. P. Wohlfarth (North Holland, Amsterdam, 1980). 46. C. Tsui, Phys. Rev. 164, 561 (1967).

Schematic drawing of a Fe2 /V5 -multilayer structure grown on an MgO single crystal. Temperature dependence of the various anisotropy components Ki as function of the absolute and reduced temperature for both multilayer structures Fe2 /V5 and Fe4 /V4 [39]. In the lower panel we show similar results for a thinner Fe2 /V5 film. 7 it is obvious that Fe4 /V4 and Fe2 /V5 show completely different temperature dependencies. This again is an unambiguous demonstration that not only the interface term at the Fe/V-interface contributes to the anisotropy but also the layer 2 and 3 in the film of 4 ML Fe.

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