The present application discloses an electrochemiluminescence immunosensor. The immunosensor includes an electrode functionalized by a nanocomposite film. The film further includes carbon nanohorns dispersed in Nafion® perfluorinated resin solution. The polymeric solution is further stabilized by magnetic nanoparticles. The immunosensor is a Point of care (POC)-based. The immunosensor is configured to work in the range from 100 ng/mL to 1 fg/mL, and has tendency to detect even traces of the tropomyosin. The immunosensor is capable to detect traces even less than 1 fg/mL, hence having high specificity for Tro-Ag detection in food products with distinguished repeatability.

An FeNi ordered alloy contained in a magnetic material has an L1.sub.0 ordered structure, is doped with an light element, and is provided as a granular particle. A method for manufacturing a magnetic material including an FeNi ordered alloy having an L1.sub.0 ordered structure includes preparing an FeNi ordered alloy provided as a granular particle, and doping a light element into the FeNi ordered alloy.

An FePt-based sintered sputtering target containing C and/or BN, wherein an area ratio of AgCu alloy grains on a polished surface of a cross section that is perpendicular to a sputtered surface of the sputtering target is 0.5% or more and 15% or less. An object of this invention is to provide a sputtering target capable of reducing particles generation during sputtering and efficiently depositing a magnetic thin film of a magnetic recording medium.

The invention provides high coercivity magnetic materials based on FeNi alloys having an L1.sub.0 phase structure, and methods for making the materials.

An L10-FeNi magnetic powder has an average particle size of 50 nm to 1 μm, and an average value of sphericity P of 0.9 or more. The sphericity P is defined as P=Ls/Lr, where Lr is a perimeter of an L10-FeNi magnetic powder particle on an image of a microscope, and Ls is a perimeter of a perfect circle that has a same area as the L10-FeNi magnetic powder particle on the image for which Lr is calculated.

An FeNi ordered alloy has an L1.sub.0 ordered structure, a mean order degree of 0.4 or more throughout a material, and a coercivity of 87.5 kA/m or more. For example, a nitriding treatment of an FeNi random alloy is performed and then a nitriding treatment is performed to obtain an L1.sub.0-FeNi ordered alloy. A volume mean particle size of a FeNi random alloy is, for example, 45 nm or more, and a treatment temperature of the nitriding treatment is, for example, greater than or equal to 300 degrees Celsius and is less than or equal to 500 degrees Celsius, and a treatment period is, for example, 10 hours or longer.

A magnetic material includes an FeNi ordered alloy. The FeNi ordered alloy has L1.sub.0 ordered structure and is provided as an acicular particle having a longer axis and a shorter axis. A method for manufacturing a magnetic material including an FeNi ordered alloy includes preparing an FeNi disordered alloy provided as an acicular particle, and performing a nitriding treatment of nitriding the FeNi disordered alloy. The magnetic material manufacturing method further includes obtaining an L1.sub.0-type FeNi ordered alloy provided as the acicular particle, by performing a denitrification treatment of removing nitrogen from the FeNi disordered alloy on which the nitriding treatment has been performed.

A method for manufacturing FeNi ordered alloy having a L1.sub.0 type order structure is provided. After a nitrification process for nitriding a powder sample of a FeNi disordered alloy arranged in a tube furnace is performed using a NH.sub.3 gas, a de-nitrification process for removing a nitrogen from the FeNi disordered alloy which is processed by the nitrification process is performed using a H.sub.2 gas. Thus, the L1.sub.0 type FeNi ordered alloy with a regularity defined by S equal to or higher than 0.5 is obtained.

A method includes converting ˜9 nm soft-magnet Al—CoPt into a hard-magnet L1.sub.0-CoPt, acid etching the hard-magnet L1.sub.0-CoPt, and annealing the acid etched hard-magnet L1.sub.0-CoPt to generate a L1.sub.0-CoPt/Pt catalyst.

A FeNi ordered alloy includes a plurality of particles having a L1.sub.0 type ordered structure. A size of the particles is in a range between 200 nm and 500 nm. A volume fraction of a pore in the particles with respect to a volume of the particles having an unit of vol. % is 5% or less.