Fabrication of Nb-Fe-B thick-film magnets by high-speed PLD method

Nakano, Masaki; Katoh, Ryoji; Fukunaga, H.; Tsutsumi, S.; Yamashita, F.

doi:10.1109/tmag.2003.815729

Cited by 41 publications

(29 citation statements)

References 5 publications

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“…Two compositions that had exhibited good characteristics in experiments with the oxidation of neodymium [9] were used, namely, Nd 2.4 Fe 14 B and Nd 2.6 Fe 14 B. The target was irradiated by a laser.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The authors have reported the fabrication of Nd-Fe-B magnetic films several tens of micrometers thick using PLD (Pulsed Laser Deposition). These magnets had coercivities above 1000 kA/m [7][8][9]. In this study, aiming at applying these film magnets to millimeter-size motors, we examined further improvement of characteristics as explained below.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of PLD‐fabricated ND‐Fe‐B film magnets and their applications to millimeter‐size motors

Nakano

Kato

Fukunaga

et al. 2007

Electrical Engineering Japan

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic properties of PLD‐fabricated ND‐Fe‐B film magnets and their applications to millimeter‐size motors

Nakano

Kato

Fukunaga

et al. 2007

Electrical Engineering Japan

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“…[1][2][3][4][5][6][7] Triode sputtering is particularly well adapted to MEMS development, as very high sputtering rates can be achieved over large surface areas and thick textured films can be produced having magnetic properties comparable to those of sintered magnets. 2,7 Hard magnetic films may be exposed to elevated temperatures either in the course of fabrication (e.g.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the magnetic properties of NdFeB thick films exposed to elevated temperatures

et al. 2018

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Hard magnetic films used in magnetic micro-systems may be exposed to elevated temperatures during film and system fabrication and also during use of the micro-system. In this work, we studied the influence of temperature on the magnetic properties of 10 μm thick out-of-plane textured NdFeB films fabricated by high rate triode sputtering. Out-of-plane hysteresis loops were measured in the range 300K – 650K to establish the temperature dependence of coercivity, magnetization at 7 T and remanent magnetization. Thermal demagnetization was measured and magnetization losses were recorded from 350K in films heated under zero or low (-0.1 T) external field and from 325 K for films heated under an external field of -0.5 T. The effect of thermal cycling under zero field on the remanent magnetization was also studied and it was found that cycling between room temperature and 323 K did not lead to any significant loss in remanence at room temperature, while a 4% drop is recorded when the sample is cycled between RT and 343K. Measurement of hysteresis loops at room temperature following exposure to elevated temperatures reveals that while remanent magnetisation is practically recovered in all cases, irreversible losses in coercivity occur (6.7 % following heating to 650K, and 1.3 % following heating to 343K). The relevance of these results is discussed in terms of system fabrication and use.

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“…High performance Nd-Fe-B-type bonded micro-magnets have increasingly found new applications, such as the magnet in micro-motor and the like [1][2][3]. For preparation of the high performance bonded micro-magnet, fine NdFe-B-type anisotropic particles are required and they need to maintain the high permanent magnetic performance even when they are processed to fine particles.…”

Section: Introductionmentioning

confidence: 99%

Coercivity of Nd-Fe-B-type Fine Particles Prepared from Different Precursor Materials

Kim¹,

Kwon²,

Lee³

et al. 2015

Journal of Magnetics

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Fine Nd-Fe-B-type particles were prepared by ball milling of different types of Nd-Fe-B precursor materials, such as die-upset magnet, HDDR-treated material, and sintered magnets. Coercivity dependence on the grain and particle size of the powder was investigated. Coercivity of the milled particles was reduced as the particle size decreased, and the extent of coercivity loss was dependent upon the precursor material. Coercivity loss in the finely milled particles was attributed to the surface oxidation. The extent of coercivity loss in the fine particles was closely linked to grain size of the precursor materials. Coercivity loss was more profound for the fine particles with larger grain size. Contrary to the fine particles from the sintered magnets with larger grain size the fine particles (~10 um) from the die-upset magnet and HDDR-treated material with much finer grain size still retained high coercivity (> 10 kOe for die-upset magnet, > 4 kOe for HDDR-treated material).

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Fabrication of Nb-Fe-B thick-film magnets by high-speed PLD method

Cited by 41 publications

References 5 publications

Magnetic properties of PLD‐fabricated ND‐Fe‐B film magnets and their applications to millimeter‐size motors

Magnetic properties of PLD‐fabricated ND‐Fe‐B film magnets and their applications to millimeter‐size motors

Characterization of the magnetic properties of NdFeB thick films exposed to elevated temperatures

Coercivity of Nd-Fe-B-type Fine Particles Prepared from Different Precursor Materials

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