Magnetic properties of ultrathin Co/Ni/Pt(111) films

Su, C. W.; Yao, Y. D.; Shern, Ching-Song

doi:10.1016/j.jmmm.2004.04.020

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…the magnetic materials are immiscible at room temperature [13]. We assume that the magnetization density of the individual Co and Ni layers is thickness independent.…”

Section: Experimental Techniquementioning

confidence: 99%

Ferromagnetic resonance study of sputtered Co|Ni multilayers

et al. 2007

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Abstract. We report on room temperature ferromagnetic resonance (FMR) studies of [t Co|2t Ni]×N sputtered films, where 0.1 ≤ t ≤ 0.6 nm. Two series of films were investigated: films with same number of Co|Ni bilayer repeats (N=12), and samples in which the overall magnetic layer thickness is kept constant at 3.6 nm (N=1.2/t). The FMR measurements were conducted with a high frequency broadband coplanar waveguide up to 50 GHz using a flip-chip method. The resonance field and the full width at half maximum were measured as a function of frequency for the field in-plane and field normal to the plane, and as a function of angle to the plane for several frequencies. For both sets of films, we find evidence for the presence of first and second order anisotropy constants, K1 and K2. The anisotropy constants are strongly dependent on the thickness t, and to a lesser extent on the total thickness of the magnetic multilayer. The Landé g-factor increases with decreasing t and is practically independent of the multilayer thickness. The magnetic damping parameter α, estimated from the linear dependence of the linewidth, △H, on frequency, in the field in-plane geometry, increases with decreasing t. This behaviour is attributed to an enhancement of spin-orbit interactions with t decreasing and in thinner films, to a spin-pumping contribution to the damping.

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“…the magnetic materials are immiscible at room temperature [13]. We assume that the magnetization density of the individual Co and Ni layers is thickness independent.…”

Section: Experimental Techniquementioning

confidence: 99%

Ferromagnetic resonance study of sputtered Co|Ni multilayers

et al. 2007

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“…Another illustrative example is the surface modification of Au, Pt, Pd, and Cu substrates by the deposition of ultrathin layers of ferromagnetic metals (for examples see Ref. [8][9][10][11][12] to create well-defined superstructures that can be incorporated in memory storage devices. In all these cases, the desired properties of the prepared material are highly dependent on surface coverage of the ultrathin metallic film.…”

Section: Introductionmentioning

confidence: 99%

Highly-Ordered Ultrathin Pd Films on Pt(111): Electrodeposition and Structural Characterization

Park¹,

Baricuatro²,

Hossain³

et al. 2007

ECS Trans.

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The present manuscript describes the preparation, surface characterization, and interfacial electrochemistry of ultrathin Pd films, from submonolayer to multilayer coverages, electrodeposited on well-defined Pt(111) surfaces. Between the coverage regimes studied, the growth of the films followed the Stranski-Krastanov mechanism.The interfacial electrochemical properties associated with the film-to-bulk transition were characterized by voltammetric techniques in combination with low-energy electron diffraction and Auger electron spectroscopy. It was found that the Pd electrodeposit started to exhibit bulk-like properties at three monolayers.Voltammetric cycling, between the hydrogen evolution and the double-layer regions, was found to exert minimal influence on the smoothening of the electrodeposited films. However, cycling within the same potential region in the presence of bromide anions (at which Br -adsorption/Br desorption takes place) considerably smoothened the initially rough Pd films, comparable to hightemperature annealing.The influence of chemisorbed bromine on the anodic dissolution of Pd was also studied. The present studies indicated that bromine was desorbed along with the dissolution of the Pd step-atoms in a manner that may be described as electrochemical digital etching. IntroductionUltrathin metallic films on foreign metal surfaces exhibit surface phenomena that are of significant interest in catalysis (1-3) and magneto-optics (4-6). The choice of the filmsubstrate combination is essentially determined by the intended resultant properties. For instance, the quest for high-performing fuel cell catalysts has stimulated investigations on the use of multimetallic films to improve the catalytic action and CO-poisoning tolerance of Pt (7). Another illustrative example is the surface modification of Au, Pt, Pd, and Cu substrates by the deposition of ultrathin layers of ferromagnetic metals (for examples see to create well-defined superstructures that can be incorporated in memory storage devices. In all these cases, the desired properties of the prepared material are highly dependent on surface coverage of the ultrathin metallic film. Establishing preparation methods that not only allow precise film-thickness control but also satisfy ECS Transactions, 3 (34) 65-103 (2007) 10.1149/1.2795613, copyright The Electrochemical Society 65 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.211.4.224 Downloaded on 2015-07-13 to IP 66 both technological demands and fundamental scientific interest remains an active research endeavor.Deposition methods for the Pt-group metals classically involve ultrahigh vacuum (UHV) conditions that effectively minimize contamination and allow surface characterization (13,14). However, for ultrathin films whose function or application involves solid-liquid interfaces, such as electrocatalysts and protective coatings, the films are best prepared and characterized in situ. In this regard, electrochemica...

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“…Figure 3͑a͒ shows the polar and longitudinal hysteresis loops of these annealed samples that were measured at 450 K. Only polar Kerr hysteresis loop is observed when d Co = 1 ML. In 1 ML Co/1 ML Ni/ Pt͑111͒, the starting temperature of Co and Ni atoms in the intermixing process is 410 K. 23 When the Co atoms intermix with the Ni atoms, some Co atoms touch and couple with the Pt atoms. However, both Kerr rotation disappear when 2 MLഛ d Co ഛ 3 ML.…”

Section: Resultsmentioning

confidence: 99%

Structural and magnetic properties of Co∕Pt(111) with Ni buffer layers

Chen

et al. 2006

Journal of Applied Physics

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Structural and magnetic properties of a chemically ordered face-centered-cubic (111) Mn alloy filmMagneto-optical Kerr effect, low-energy electron diffraction, and Auger electron spectroscopy were used to investigate the magnetic properties and the growth mode of ultrathin Co films deposited on 1 ML ͑monolayer͒ Ni/ Pt͑111͒ at room temperature. No Kerr signal was observed when the thickness of Co film was below 3 ML, and the easy axis of the magnetization was in plane when the thickness of Co was greater than 3 ML at room temperature. The polar Kerr signal appeared after the sample was annealed at 450 K for 1 ML of Co. Further studies in the magnetic properties and surface composition of 3 ML Co/1 ML Ni/ Pt͑111͒ during an annealing process showed that the out-of-plane magnetization enhances significantly when Co and Ni atoms diffuse into the Pt substrate. The coercivity of the system can be adjusted by changing the annealing temperature. Measuring at room temperature, the coercivity increases when the annealing temperature rises. The possible mechanism of the evolution of magnetic properties with the structure of the interface is discussed.

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Magnetic properties of ultrathin Co/Ni/Pt(111) films

Cited by 4 publications

References 11 publications

Ferromagnetic resonance study of sputtered Co|Ni multilayers

Ferromagnetic resonance study of sputtered Co|Ni multilayers

Highly-Ordered Ultrathin Pd Films on Pt(111): Electrodeposition and Structural Characterization

Structural and magnetic properties of Co∕Pt(111) with Ni buffer layers

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