Nano-scale materials development for future magnetic applications

McHenry, Michael E.; Laughlin, David E.

doi:10.1016/s1359-6454(99)00296-7

Cited by 423 publications

(209 citation statements)

References 64 publications

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“…The hexagonal CoCrPt films improved with thickness, indicating a preferred (001) hexagonal texture with thickness, which reduces the total surface energy. 6 The addition of Cr decreases the alloy saturation magnetization allowing an out-of-plane uniaxial anisotropy. This is seen in Figs.…”

Section: Iiii Results and Discussionmentioning

confidence: 99%

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Fabrication of thin films for a small alternating gradient field magnetometer for biomedical magnetic sensing applications

Jones

McNerny

Sokalski

et al. 2011

Journal of Applied Physics

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Thin film alternating gradient field magnetometers (AGFM) have potential for measuring magnetic moments of minerals in extraterrestrial soil samples. AGFM sensors offer increased spatial resolution required to detect magnetic nanoparticles for biosensing applications. We have fabricated a patterned thin film with the properties necessary for use in a small AGFM system. Hexagonalclose-packed CoCrPt thin films of 20 and 500 nm were sputtered (nominal composition of Co 66 Cr 15 Pt 19 ), showing a high magnetic moment and large out-of-plane anisotropy. The films showed a Dh 50 of better than 3 for the (002) CoCrPt peak for all films, which improves with thickness. The texture is partly due to the NiW and Ru underlayers. The films showed an out-of-plane easy axis, indicating a strong uniaxial anisotropy that exceeds the shape demagnetization energy. This is due to the addition of Cr, which decreases the magnetic moment of the films; magnetoelastic coupling and film stresses may also aid in achieving a perpendicular anisotropy. The first-order uniaxial anisotropy constants were calculated as a function of temperature, ranging from 3.7 Â 10 6 ergs/cm 3 at room temperature to 6.8 Â 10 5 ergs/cm 3 at 500 C, and the T dependence agrees with Akulov's theory for uniaxial materials. The thickest film was etched with a checkerboard pattern to decrease the demagnetization effects, which are seen more influentially in the thicker films. This opened up the hysteresis loop, and decreased the amount of field necessary to overcome the thin film geometry.

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Section: Iiii Results and Discussionmentioning

confidence: 99%

“…4 and 5) was chosen as the sensor magnetic material because of its large magnetic moment ($425 emu/cc), corrosion resistance, and potential for large perpendicular anisotropy. 6 A checkerboard pattern was etched into the film to decrease the demagnetizing field associated with thin film geometries.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of thin films for a small alternating gradient field magnetometer for biomedical magnetic sensing applications

Jones

McNerny

Sokalski

et al. 2011

Journal of Applied Physics

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“…[1][2][3][4] The traditional magnets have been unable to meet such requirements. Recently nanocrystalline soft magnetic alloys have attracted great attention due to their excellent soft magnetic properties and simple preparation.…”

Section: Introductionmentioning

confidence: 99%

The effect of Ni addition on microstructure and soft magnetic properties of FeCoZrBCu nanocrystalline alloys

et al. 2017

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(Fe0.7Co0.3-xNix)88Zr7B4Cu1 nanocrystalline alloys were developed with the aim of improving the magnetic properties while keeping high Curie temperature (TC). It was revealed that Ni addition inhibited the precipitation of metastable fcc-(Fe,Co,Ni) phase hence increased thermal stability. Although the saturation magnetic flux density (Bs) showed a slight decrease, uniform nanostructure with small grain size and high volume fraction of crystals was formed with increasing Ni addition. As a result, the (Fe0.7Co0.3-xNix)88Zr7B4Cu1 nanocrystalline alloys exhibited excellent magnetic properties with a high Bs of 1.54-1.79 T, low coercivity (Hc) of 17-20 A/m and low core loss of 9.1-11.1 W/kg at 1 T and 400 Hz. The combination of high TC of 747-972 °C, low core loss as well as low material cost promised this FeCoNiZrBCu alloys broad application prospect at high temperature.

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“…Magnetic nanoparticles have found widespread applications in modern electronics and other advanced industries due to their morphology and unique physical properties (O'Handley 2000;Gleiter 2000;McHenry and Laughlin 2000;Makhlouf et al 1997). In magnetic nanoparticles, the surface spins dominate the magnetization due to their lower coordination and uncompensated exchange couplings.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of superparamagnetic nickel oxide particles by chemical route

Kalaie

Youzbashi

Meshkot³

et al. 2015

Appl Nanosci

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Homogeneous nickel oxide (NiO) nanoparticles with different sizes between 6 and 30 nm with narrow size distribution and low agglomeration were synthesized successfully by using different precipitated precursors and heat treatment under certain conditions. Powders were analyzed by different characterization methods. X-ray diffraction patterns revealed that the sizes of nanoparticles synthesized by nickel hydroxide and nickel oxalate precursors are under 10 nm, which are in good agreement with transition electron microscopy and field emission electron microscopy results. According to the vibrating sample magnetometer data, the NiO nanoparticles with sizes about 6 nm show superparamagnetic behavior. For superparamagnetic particles, the magnetization at maximum applied field of 20 kOe is 2.46 emu g -1 .

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Nano-scale materials development for future magnetic applications

Cited by 423 publications

References 64 publications

Fabrication of thin films for a small alternating gradient field magnetometer for biomedical magnetic sensing applications

Fabrication of thin films for a small alternating gradient field magnetometer for biomedical magnetic sensing applications

The effect of Ni addition on microstructure and soft magnetic properties of FeCoZrBCu nanocrystalline alloys

Preparation and characterization of superparamagnetic nickel oxide particles by chemical route

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