Microstructure and magnetic properties of SmCo films

Speliotis, Th.; Niarchos, D.

doi:10.1016/j.jmmm.2004.11.383

Cited by 28 publications

(20 citation statements)

References 5 publications

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“…As presented in our previous work [5] and as published elsewhere in the literature [6] sputtering a binary alloy target like SmCo using a wide range of deposition pressures p Ar , results in the following: low pressures promote films richer in lighter atoms -in our case Co-, while higher p Ar , result in an enrichment of the film with heavier atoms -Sm in our case. As was confirmed through the XRD studies, the deposition of SmCo films at room temperature resulted in amorphous samples, while the hard magnetic properties developed only by postdeposition annealing under vacuum at temperatures ranging from 550 o C up to 650 o C. Figure 1 shows the XRD results for SmCo films with Ta buffer and cap layers sputtered at different deposition pressures that were annealed in vacuum at 600 °C for 30 min.…”

Section: Resultssupporting

confidence: 76%

Effect of deposition pressure and post deposition annealing on SmCo thin film properties

Speliotis

Makarona

Chouliaras³

et al. 2008

Phys. Status Solidi (c)

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Biopolymer‐single walled carbon nanotube (SWNT)‐biopolymer fibers were prepared using a continuous flow spinning approach. Polyelectrolyte complexation was facilitated by injecting a SWNT‐biopolymer dispersion into a coagulation bath containing a biopolymer of opposite charge. We showed that the ability to spin fibers and their properties depend on processing conditions such as polyelectrolyte pH, sonolysis regime (conditions employed to disperse SWNT) and the order of adding the anionic and cationic biopolymer solutions. Maximizing the ionic nature through changes in the pH increased spin‐ability, while combining a sonicated dispersion with an as‐prepared (non‐sonicated) polyelectrolyte solution allowed us to optimize sonolysis conditions while retaining spin‐ability of fibers with smooth surface morphology. Addition of the cationic biopolymer‐SWNT dispersion to the anionic biopolymer solution resulted in mechanical reinforcement with the increase in SWNT loading fraction. All fibers decreased their electrical resistance upon exposure to water vapor.

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Section: Resultssupporting

confidence: 76%

Effect of deposition pressure and post deposition annealing on SmCo thin film properties

Speliotis

Makarona

Chouliaras³

et al. 2008

Phys. Status Solidi (c)

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“…SmCo 5 thin films with high coercivity and high-magnetic anisotropy have been widely studied in the last three decades. It has been found that appropriate single crystal substrates such as MgO (1 0 0), MgO (11 0) [4][5][6][7][8] and Si (1 0 0) [9][10][11][12] can lead to epitaxial or highly textured growth of SmCo 5 films with high coercivity values. On the other hand, for practical reason, many researchers have dedicated themselves to develop techniques for high coercivity SmCo 5 films grown on amorphous or polycrystalline substrates such as glass, Al and Al 2 O 3 [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and magnetic properties studies of SmCo5 thin films grown on MgO and glass substrates

Zhang

Chen

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…Due to the thickness and high crystallinity, also the K b peak of the MgO substrate is visible. In Figure 1(b), the region around the SmCo (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) peak is shown, for films grown with a sputter pressure of 1.5, 3.0, 7.5, and 10.5 Â 10 À3 mbar. Clearly visible is that, with decreasing pressure, the peaks shift to a higher angle.…”

Section: A Composition and Morphologymentioning

confidence: 99%

“…However, for various applications, growing Sm-Co thin films from alloy targets is a desirable option since only one deposition source is needed. Still, as far as we know, relatively few groups [12][13][14][15][16][17][18][19][20] have reported on the growth of Sm-Co thin films from single alloy targets. The purpose of this work is to show what the properties are of such films, grown on MgO(100), and in a range of pressures.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Sm-Co thin films grown on MgO(100) deposited from a single alloy target

Verhagen

Boltje

Ruitenbeek

et al. 2014

Journal of Applied Physics

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We have grown epitaxial Sm-Co thin films by sputter deposition from a single alloy target with a nominal SmCo 5 composition on Cr(100)-buffered MgO(100) single-crystal substrates. By varying the Ar gas pressure, we can change the composition of the film from a SmCo 5 -like to a Sm 2 Co 7 -like phase. The composition, crystal structure, morphology, and magnetic properties of these films have been determined using Rutherford Backscattering, X-ray diffraction, and magnetization measurements. We find that we can grow films with, at room temperature, coercive fields as high as 3.3 T, but with a remanent magnetization which is lower than can be expected from the texturing. This appears to be due to the Sm content of the films, which is higher than expected from the content of the target, even at the lowest possible sputtering pressures. Moreover, we find relatively large variations of film properties using targets of nominally the same composition. At low temperatures, the coercive fields increase, as expected for these hard magnets, but in the magnetization, we observe a strong background signal from the paramagnetic impurities in the MgO substrates.

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Microstructure and magnetic properties of SmCo films

Cited by 28 publications

References 5 publications

Effect of deposition pressure and post deposition annealing on SmCo thin film properties

Effect of deposition pressure and post deposition annealing on SmCo thin film properties

Microstructure and magnetic properties studies of SmCo5 thin films grown on MgO and glass substrates

Magnetic properties of Sm-Co thin films grown on MgO(100) deposited from a single alloy target

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