Optical anisotropy and magneto-optical properties of Ni on preoxidized Cu(110)

Herrmann, Th; Ludge, K; Richter, W; Georgarakis, KG; Poulopoulos, P; Nunthel, R; Lindner, J; Wahl, M; Esser, N

dc.contributor.author	Herrmann, Th	en
dc.contributor.author	Ludge, K	en
dc.contributor.author	Richter, W	en
dc.contributor.author	Georgarakis, KG	en
dc.contributor.author	Poulopoulos, P	en
dc.contributor.author	Nunthel, R	en
dc.contributor.author	Lindner, J	en
dc.contributor.author	Wahl, M	en
dc.contributor.author	Esser, N	en
dc.date.accessioned	2014-03-01T01:24:49Z
dc.date.available	2014-03-01T01:24:49Z
dc.date.issued	2006	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17446
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	SPIN REORIENTATION TRANSITION	en
dc.subject.other	ULTRATHIN NI/CU(001) FILMS	en
dc.subject.other	REFLECTANCE-DIFFERENCE SPECTROSCOPY	en
dc.subject.other	ADDED-ROW RECONSTRUCTION	en
dc.subject.other	ELECTRONIC-STRUCTURE	en
dc.subject.other	MAGNETIC-ANISOTROPY	en
dc.subject.other	SURFACE	en
dc.subject.other	GROWTH	en
dc.subject.other	CO	en
dc.subject.other	TEMPERATURE	en
dc.title	Optical anisotropy and magneto-optical properties of Ni on preoxidized Cu(110)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.73.134408	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.73.134408	en
heal.identifier.secondary	134408	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	We investigate the growth mode and the magnetism of Ni on Cu(110) substrates using oxygen as a surfactant. Layer by layer growth on oxidized Cu(110) is obtained, in contrast to the island growth found on clean Cu(110) substrates. The main emphasis of our work addresses the potential of optical spectroscopy for analyzing structure and magnetism. For that purpose we use a spectrometer which allows us to record reflectance anisotropy (RAS) and magneto-optic Kerr (MOKE) spectra simultaneously and in situ during film growth, in the spectral range from 0.72 to 6.5 eV. We show that RAS is very useful for monitoring the growth of Ni on Cu(110), since it reveals information on the atomic surface structure and on the strain evolution during the growth process. MOKE, on the other hand, is sensitive to the magnetic properties of the epitaxial Ni film. Combining RAS and MOKE thus allows us to directly relate growth mode and magnetic properties and to identify correlations in between. As such, an out-of-plane magnetization for Ni films between 7.5 and 35 ML thickness is observed, correlated with a flat layer morphology, i.e., two-dimensional growth mode of the Ni film. Above 35 ML roughening sets in and the magnetization direction rotates towards in-plane orientation again. Well below 35 ML, between 14 ML and 18 ML of Ni, the strain due to pseudomorphic growth is relaxed, correlated with a strong increase in coercivity due to dislocation formation. Mandatory for a meaningful analysis of the Voigt parameter of Ni is the sophisticated optical modeling of the layer system. Doing so, we prove that a modification of electronic properties (d -band narrowing) of the Ni film in the pseudomorphic growth regime does not occur, in contrast to expectations. © 2006 The American Physical Society.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.73.134408	en
dc.identifier.isi	ISI:000237153800062	en
dc.identifier.volume	73	en
dc.identifier.issue	13	en