Selective area laser-induced deposition of rare earth hexaborides from solution

Zhong, Zhenchen; Dowben, Peter A.; Sellmyer, David J.

doi:10.1016/s0167-577x(98)00113-x

Cited by 9 publications

(2 citation statements)

References 30 publications

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“…The deposition of chromium oxides by laser-induced solution deposition (LISD) (the experimental system of LISD is described elsewhere [20]) were carried out by an argon ion-laser (the Coherent Innova 90 Series Ion Laser). The deposition solution was CrCI 2 dissolved in solvents containing various mixtures of methanol, cyclohexane, tetrohydrofuran (THF), and diethlether.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Chromium Oxide Nanoparticles/Thin Films

Zhong

Cheng

2001

MRS Proc.

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Well-dispersed nanoscale textured chromium oxide particles/thin films can be fabricated under certain conditions by laser-induced solution deposition (LISD) from organic solutions and by using selective organometallic chemical vapor deposition (OMCVD). The fabricated nanoparticles/thin films are characterized by scanning electron microscope (SEM), EDX, X-ray diffraction, and magnetic measurements. We have successfully demonstrated that the LISD and OMCVD are unique techniques for fabricating uniformly-distributed thin films but anistropic chromium oxide particles, which can be used in electro-magnetic devices. The magnetization measurements show that both types of chromium oxides are presented and that the Curie temperature T, and the saturation magnetization field may be adjustable by controlling the stoichiometry.

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Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Chromium Oxide Nanoparticles/Thin Films

Zhong

Cheng

2001

MRS Proc.

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“…The laser-assisted deposition from solution (LISD) techniques has been successfully used to deposit ReB 6 (Re=rareearthmetal) [21,22,23 and 24], copper [25 and 26], palladium [27 and 28] and more complex materials like LaNiO 3 [29]. Laser assisted deposition from a solution of silver nitrate was also used to deposit silver clusters [30].…”

mentioning

confidence: 99%

Fabrication of chromium oxide nanoparticles by laser-induced deposition from solution

Zhong

Cheng

Bosley

et al. 2001

Applied Surface Science

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Metallic wires and dots can be obtained by reducing a metallic salt in the pores of a membrane. Electrodeposition processes in nanometer-sized pores of aluminum oxide membranes was reported more than 30 years ago [1]. Ultra-dense arrays (reaching 10 11 cm −2 ) of nanometer-size electrodeposited columns have been successfully produced on substrates made by electron lithography [2]. The use of plastic porous membranes has been extensively investigated and a variety of nano-materials have been successfully made by this method [3 and 4]. The reduction of metal ions in the membrane creates an assembly of wires, several micrometers in length, with a diameter chosen in the range 30 nm to a few micrometers [5, 6 and 7]. This is of great interest because magnetic systems of very small dimensions can reveal mesoscopic and quantum effects. Single electron blocking effects have been evidenced in oxidized STM tips or substrates [8], and similar effects were reported in nanowires smaller than 0.01 μm 2 [5]. Initial results on magnetoresistance measurements on nanometer diameter Ni/NiO/Co wires [6] provide evidence of an impurity in the tunnel barrier playing a role in Coulomb blockade [6 and 9], and indeed negative tunnel magnetoresistance might be observed when impurities are present in the barrier [6]. The extension of the Coulomb blockade effect to the ferromagnetic case is at its infancy, but initial measurements [10, 11 and 12] and theories [13 and 14] indicate that such systems can show enhanced magnetoresistive properties. An estimate for the spin-fl ip time τ SF , deduced from diffusive transport bulk values is of the order of 10 −12 s. A more relevant time scale for very small metallic particles can be found in the results of Ralph et al. [15 and 16] nanoparticles. They gave an estimate of 10 −8 -10 −9 s for the relaxation rate of excited states. Making nanoscale particle of ferromagnetic and antiferromagnetic particles is the key to future research in this area. Chromium oxides have attracted much attention recently because of their importance both in science and technology. Band-structure calculations [17] predict that CrO 2 is a half-metallic ferromagnet -a system which is metallic for one spin direction and insulating for the opposite spin direction. This contention is supported by refl ectivity measurements [18] and Andreev scattering [19 and 20]. Unfortunately, it is very diffi cult to fabricate CrO 2 nanoparticles by using conventional methods due to the high temperatures required and the metastablity of CrO 2 phase, nor there has been much success with the fabrication of nanoparticles in the antiferromagnetic insulating Cr 2 O 3 phase.Laser-assisted deposition from solution is clearly compatible with electrochemical deposition. The laser-assisted deposition from solution (LISD) techniques has been successfully used to deposit ReB 6 (Re=rareearthmetal) [21,22,23 [29]. Laser assisted deposition from a solution of silver nitrate was also used to deposit silver clusters [30]. In both the deposition of coppe...

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Liquid Phase Photodeposition Processes From Colloid Solutions

Peled

Mirchin

Photo-Excited Processes, Diagnostics and Applications

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Selective area laser-induced deposition of rare earth hexaborides from solution

Cited by 9 publications

References 30 publications

Fabrication and Characterization of Chromium Oxide Nanoparticles/Thin Films

Fabrication and Characterization of Chromium Oxide Nanoparticles/Thin Films

Fabrication of chromium oxide nanoparticles by laser-induced deposition from solution

Liquid Phase Photodeposition Processes From Colloid Solutions

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