ANNEALING EFFECTS ON THE CRYSTALLOGRAPHIC AND MAGNETIC PROPERTIES OF Co/Pt MULTILAYERS

Abstract

400 0 e and SOOoe.With annealing, the saturation magnetization Ms and the saturation Kerr rotation angle increase and approach the values of alloyed films. On the other hand, the perpendicular anisotropy energy decreases monotonically owing to both the reduction of the interfacial anisotropy energy and the increase of the demagnetizing energy 2nMs2,These changes in the magnetic properties are explained by the alloying at the layer boundaries due to annealing. The diffusion process is analyzed by means of X-ray diffraction method and is suggested to be connected with the "grain boundary diffusion", The change in the composition profiles in the double layered films of 1000j\Co/1OOOj\Pt has been examined by Rutherford Backscattering Spectroscopy. The RBS data also indicate that Co and Pt atoms migrate through the grain boundaries and the column boundaries.

Spin injection light-emitting diode with vertically magnetized ferromagnetic metal contacts

“…Tb/bcc-Fe multilayers are known to exhibit spontaneous out-of-plane magnetization [17][18][19] induced by perpendicular magnetic anisotropy at the Tb/ Fe interfaces. 20,21 We verified by polar magnetic hysteresis loop measurements and 57 Fe-tracer layer Mössbauer spectroscopy that a significant perpendicular magnetization component is present in the Tb/ Fe multilayer and in the epitaxial Fe͑001͒ film at and below 300 K. 22 The electrical operation of our LED structure was analyzed by measuring a current versus voltage ͑I-V͒ curve. It is shown in Fig.…”

Monte Carlo investigation of transition and compensation temperatures of Fe/Tb multilayers

“…This result is inconsistent with some investigations that predict a limit value of 200 K 6 ͑the bulk critical temperature of the amorphous Fe͒ but agrees with others. 2,3 Since the long-range ordering is driven by the disordered interfaces, the limit value will be the transition temperature of an isolated disordered interface. So, the behavior of amorphous Fe/Tb multilayers will be significantly different from the behavior of the Fe 1Ϫx Tb x amorphous alloys when t Tb /t Fe →0.…”

“…For example, investigations of thermal dependence of the magnetization in amorphous Fe/Tb multilayers with disordered interfaces have been performed using the mean field theory. 2,3,[7][8][9][10][11][12] The spin configurations in crystalline Fe/Gd multilayers in an external field have also been investigated with this technique. [13][14][15][16] The effective field theory which is a bit more sophisticated has been considered to study Fe/Tb and Fe/Gd multilayers with abrupt or disordered interfaces.…”

Enhancement of exchange bias in thin PtMn antiferromagnets by Ru and Cr nano-lamination

“…This reduction is limited by an incomplete phase transformation from chemically disordered FCC to ordered FCT (L1 0 ) [1,2]. optimization of the alloy composition [3], initial size of granular microstructure (i.e. process conditions) [4], seed-layer materials (e.g.…”