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Huang C.-F.,Yuan Ze University | Sun A.-C.,Yuan Ze University | Wu H.-Y.,Yuan Ze University | Yuan F.-T.,Isentek Ltd. | Hsu J.-H.,National Taiwan University
Journal of Applied Physics | Year: 2014

[Co1.0/Pt0.75]n multilayers consisting of 1.0-nm-thick Co and 0.75-nm-thick Pt layers with n = 2-6 were grown on glass substrates with and without a Pt underlayer at room temperature (RT). In this study, the effects of total thickness and Pt underlayer on magnetic properties and microstructures are investigated. Without a Pt underlayer, the [Co 1.0/Pt0.75]n film exhibits soft magnetic behaviors due to poor crystallization. After the inclusion of a Pt underlayer between magnetic layer and glass substrate, the [Co1.0/Pt 0.75]n films show significant perpendicular magnetic anisotropy (PMA), out-of-plane coercivity, and squareness as the total thickness of [Co1.0/Pt0.75]n is in the range of 5.25-10.5 nm. The induced PMA is attributed to the epitaxial growth of CoPt grains along Pt(111) underlayer. The RT-prepared CoPt film with PMA shows high potential in future applications of spintronics. © 2014 AIP Publishing LLC. Source

Yuan F.-T.,Isentek Ltd. | Sun A.-C.,Yuan Ze University | Huang C.F.,Yuan Ze University | Hsu J.-H.,National Taiwan University
Nanotechnology | Year: 2014

Ultrathin percolated high-Ku magnetic films with thicknesses of 2 nm are realized simply by using sputter deposition and post annealing. L11 CoPt:MgO, with Ku on the order of 107 erg cm-3, was deposited on a MgO(111) substrate at 350 °C, followed by post annealing to induce complete segregation of the added MgO dopants. The optimized film shows significant enhancement of the out-of-plane coercivity, approximately an order of magnitude greater than that of the CoPt binary film, a remanence ratio close to unity, considerably reduced in-plane magnetization, sharp perpendicular magnetic reversal, and reduced surface roughness in the range of a few angstroms. Microstructure results indicate that MgO precipitates into grains within the interconnected L11 grains after appropriate post annealing. The MgO grains, with sizes in the range 2-7 nm, form coherent interfaces to the CoPt matrix and penetrate through the whole depth of the film. The development of ideal non-magnetic domain wall pinning sites explains the optimization of the perpendicular magnetic properties. The advantages of a simple fabrication process, a thin film layer structure, and remarkable enhancement of the magnetic characteristics demanded by ultrahigh-density recording reveal its potential for practical applications. © 2014 IOP Publishing Ltd. Source

Isentek Inc. | Date: 2012-04-03

A magnetic sensor is disclosed. The magnetic sensor includes a first magnetic sensing device, a second magnetic sensing device and a third magnetic sensing device. The first magnetic sensing device and the second magnetic sensing device sense X-axis and Y-axis magnetic fields. The third magnetic sensing device is a Hall device to sense Z-axis magnetic field by Hall effect. The first magnetic sensing device is disposed in a 90 degrees position related to the second magnetic sensing device.

A magnetic field sensing module including a plurality of magnetic flux concentrators and a plurality of sensing elements is provided. Each of the magnetic flux concentrators extends along a first extension direction, and the magnetic flux concentrators are arranged along a second direction. The sensing elements are respectively disposed at a position corresponding to a position between the magnetic flux concentrators and positions corresponding to two sides of the magnetic flux concentrators arranged along the second direction. Sensing directions of the sensing elements are substantially the same. A measurement method and a manufacturing method of a magnetic field sensing module are also provided.

Chang H.W.,Tunghai University | Yuan F.T.,Isentek Ltd. | Tu K.T.,Tunghai University | Lin S.Y.,Tunghai University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2016

Bi1-xAxFeO3 (BAFO) polycrystalline films (A = Ca, Sr, and Ba; x = 0.05, 0.1, and 0.15) were deposited on an optimized 20-nm-thick Pt bottom electrode on glass substrates at 450 °C via pulsed laser deposition. Perovskite single phase is confirmed in all studied BAFO films. With increasing content of the substituents, the refinement of microstructure and surface roughness becomes more obvious. Different from BAFO bulks, the studied BAFO polycrystalline films achieve coexistence of good ferroelectric and ferromagnetic properties. Remanent polarization (2Pr) of 47-124 μC/cm2 and electrical coercive field of 290-557 kV/cm are obtained, while the saturation magnetization of 5.9-13.9 emu/cm3 and coercivity of 1211-1380 Oe are attained for the substitution of Ca2+, Sr2+, or Ba2+ for Bi3+. The multiferroic properties and leakage behavior with A substitution and as a function of its content x are also discussed. © 2016 Elsevier B.V. Source

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