Perpendicular anisotropy in Co/Ru epitaxial superlattices

Dinia, A.; Ounadjela, K.; Arbaoui, A.; Suran, G.; Müller, D.; Panissod, P.

doi:10.1016/0304-8853(92)91584-g

Cited by 25 publications

(4 citation statements)

References 5 publications

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“…The value of t c is approximately 9 Å. The anisotropy constant values and the critical Co thickness are very close to the known experimental values given in the literature 31 for evaporated Co/ Ru͑0001͒ superlattices.…”

Section: Magnetic Anisotropysupporting

confidence: 86%

Oscillations of the ferromagnetic resonance linewidth and magnetic phases in Co/Ru superlattices

et al. 2008

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The interlayer exchange coupling ͑IEC͒ and the magnetic anisotropy of Co/Ru͑0002͒ hcp superlattices, produced by magnetron sputtering, were studied by ferromagnetic resonance ͑FMR͒. The main mode and a secondary mode, with a higher resonance field, were identified in the perpendicular FMR spectra. The secondary mode is attributed to the resonance of the bulk of Co magnetic layers while the main mode is associated with the Co/Ru interfacial phase. The linewidth dependence of the main FMR mode on the Ru thickness clearly reproduces the oscillations of the IEC between Co layers. These oscillations are attributed to the effects of lateral inhomogeneities of the IEC strength and have a period of about 12 Å. Moreover, they are in good agreement with magnetoresistance and magnetization measurements performed in the same samples. The dependence of the effective anisotropy constants on the Co layer thickness leads to the volume and surface anisotropy constants of K V = −1.10ϫ 10 7 erg/ cm 3 and 2K s = 0.95 erg/ cm 2 , respectively, and also to a critical Co thickness of approximately 9 Å below which the magnetization is oriented perpendicular to the plane of the film.

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Section: Magnetic Anisotropysupporting

confidence: 86%

Oscillations of the ferromagnetic resonance linewidth and magnetic phases in Co/Ru superlattices

et al. 2008

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“…Also, note that the hcp (0002) texture of Ru works as a starting template for the fcc (111) Co/Pd layers. 20 Figure 2 summarizes the effects of annealing on the magnetic properties as a function of the Pd-thickness t Pd . Two annealing conditions were studied: 1 h 300 C vacuum annealing and 12 min RTA under N 2 atmosphere at higher temperatures.…”

mentioning

confidence: 99%

Ultra-thin Co/Pd multilayers with enhanced high-temperature annealing stability

Gottwald

Lee

Kan

et al. 2013

Applied Physics Letters

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Understanding the thermal budget of perpendicular materials is crucial for the potential application perpendicular magnetic tunnel junctions. In this paper, we study the effects of high-temperature rapid thermal annealing on the structural and magnetic properties of ultra-thin Co/Pd multilayers deposited at room temperature. It is shown that perpendicular magnetic anisotropy of ultra-thin Co/Pd multilayers improves with increasing annealing temperature up to 425 °C. This property of ultra-thin Co/Pd multilayers provides increased thermal budgets for CMOS-integrated magnetic devices.

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“…Some examples which have been studied include Co I Au (111) [11,16], Co/NiOll) [17], Co/Pd [18], Co/Pt [19], Co/Ru(OOI) [20], Fe (001) I noble metal (Ag [21], Au [22]), W(110)/Fe(110)/noble metal (Cu, Ag or Au) [23]. These reorientations manifest themselves as a change in the form of the hysteresis loop as measured using a SQUID or the polar or longitudinal magneto-optic Kerr effects.…”

Section: Magnetic Anisotropy Of Thin Filmsmentioning

confidence: 99%

Magnetic Thin Films and Multilayers

2002

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Progress in high vacuum and ultra high vacuum material preparation techniques now allow the preparation of artificial structures consisting of ultra thin films of magnetic materials, as well as multilayer systems containing stacks of different materials, some of which being magnetic. In addition, many techniques are also now available for both the structural and magnetic characterization of these systems.The thickness of the individual layers may vary from one atomic plane to some tens of nanometres. These thicknesses are comparable to some characteristic length scales in magnetism: the Fermi wavelength, the range of exchange interactions, the domain wall thickness, the mean free path of electrons ...In general, magnetism is very sensitive to the local atomic environment. As it is possible to vary this environment in a very controlled way in thin films and multilayers, unique phenomena, which do not exist in bulk materials, can be observed in these systems.These phenomena include the possibility to stabilise new crystallographic phases, non-existent or very unstable in bulk form, the appearance of magnetic anisotropy induced by interfacial stress, magnetic coupling effects between adjacent films, giant magneto resistance, tunnel magnetoresistance.Apartfrom their interestfrom a fundamental point of view, thin films and multi/ayers find many applications, particularly in the area of magnetic or magneto-optical recording. These include media for both parallel and perpendicular magnetic recording, mediafor magneto-optical recording, soft magnetic thin films (flux guides, transformers ... ), magnetostrictive materials (microactuators), and magnetoresistive materials for magnetic field sensors.

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Perpendicular anisotropy in Co/Ru epitaxial superlattices

Cited by 25 publications

References 5 publications

Oscillations of the ferromagnetic resonance linewidth and magnetic phases in Co/Ru superlattices

Oscillations of the ferromagnetic resonance linewidth and magnetic phases in Co/Ru superlattices

Ultra-thin Co/Pd multilayers with enhanced high-temperature annealing stability

Magnetic Thin Films and Multilayers

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