Use the junction of collinear nickel oxide insulators to generate spin-polarized current

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Nickel oxide overview

Compounds with the chemical name NiO are compounds containing nickel (II). It is a main oxide of Nickel. Nickel oxide, a thermally stable, highly insoluble source of nickel, is suitable for applications such as glass, ceramics, and optics. Nickel oxide, the main nickel oxide, is a green solid. Every year, millions of kilos of nickel oxide powder (NiO) with high purity (99.999%), are produced. Oxide doesn’t conduct electricity.

However, certain oxides with perovskite structures have conductivity on the cathodes for solid oxide fuel cell and oxygen generation systems. Compounds containing one or more metal cations and at least one oxygen ion. These compounds are stable and insoluble in aqueous solution (water). They can be used for ceramic structures and lightweight structural components, including for fuels batteries and advanced electronic devices.

Metal oxides react with acids, strong reducing substances and sputtering targets in redox reaction. Nickel oxide can be produced as powders, particles, tablets, nanopowders and sputtering targets. Nickel oxide can usually be obtained immediately in many cases. Nickel oxide in high purity, nanopowder and submicron forms are possible.

Nickel oxide: What are its uses?

Nickel oxide can be used for electrical ceramics like thermistors or varistors. As a ceramic, glass and glaze pigment, ferrite (nickelzinc ferrite), can be used.

NiO can be used for a number of professional purposes. In general, “chemical grade” is distinguished from “metallurgical quality”. Chemical grade is a relatively purified material that is used in special applications. Metalurgical grade is mostly used to create alloys. It is used by the ceramics industry to produce glass, ferrite, and enamel. It is used in the production of nickel steel alloys. Charles Edouard Guillaume received the 1920 Nobel Prize in Physics in recognition of his research on nickel steel alloys he named Invar and Irenevar.

NiO, or hole transport material, is used in thin-film photovoltaic cells. NiO is also used in the manufacture of nickel-iron battery (also called Edison batteries) as well as fuel cells. It is also the precursor to many nickel-iron batteries (also known as Edison batteries) and a component of fuel cells. NiO has been used for many years to produce NiCd rechargeable battery used in electronic devices. In complementary electrochromic devices, NiO is often used as anode electrode instead of tungsten dioxide (cathode electrode).

About 4,000 tons of chemical-grade NiO are produced annually. Black NiO, formed from mineral acid treatment, is the precursor to nickel sal. NiO can be used as a hydrogenation catalyst.

The reduction of nickel oxide to metallic Nickel can be achieved by heating with hydrogen or carbon. It combines with sodium and potassium oxides at high temperatures (> 700degC) to form corresponding nickelates.

Is nickel oxide soluble in water?

Nickel oxide is soluble in acid, potassium cyanide and ammonium hydroxide. It is insoluble in hot and cold water, a caustic alkali solution.

Use the junction of collinear nickel oxide insulators to generate spin-polarized current

Antiferromagnetic materials have shown promise for spintronics applications because they are robust to magnetic field disturbances, do not generate stray fields, and exhibit ultra-fast dynamics. However, due to the symmetry of the spin sublattice, it is still difficult to generate and manipulate spin-polarized currents in such materials. The use of nickel oxide may help overcome this limitation.

We have constructed a prototype junction consisting of a gold-nickel-gold-gold junction, in which a collinear nickel oxide insulator can destroy the spin sublattice symmetry using an external bias voltage. Such a system demonstrates the emergence of spin-polarized currents by inducing non-equivalent transmission of spin-up and spin-down currents.

“Due to the symmetry of the spin sublattice, it has long been believed that spin-polarized current cannot be obtained in collinear antiferromagnetic materials,” said author Zhang Xianmin. “Here, we show that the symmetry of the antiferromagnetic spin sublattice may be destroyed by the bias voltage, and then a spin-polarized current is induced in the collinear antiferromagnetic material.”

This work provides a way to improve the large resistance mismatch, which prevents small spin injection from the metal electrode to the semiconductor, which will make it easier to combine spintronics and semiconductor electronics.

In addition to adjusting the amplitude, the team was also able to modify the sign of spin polarization by changing the bias. The system can achieve up to 80% positive spin polarization at approximately 0.9 volts, while negative spin polarization exceeds a bias voltage of 1.6 volts.

Zhang hopes that these findings will help pave the way for the development of new antiferromagnetic spintronic devices, and hopes to continue exploring the manipulation of such materials.

Is nickel oxide acidic or alkaline?

Unless otherwise stated, data on materials are provided in standard conditions (at 25degC [77degF], 100 kPa). Nickel hydroxide is an inorganic compound with the chemical formula NiO(OH). It is a black solid, insoluble in all solvents, but will be attacked by alkalis and acids.

Is nickel oxide magnetic?

The branched nickel oxide nanocrystals with narrow size distribution are obtained by the solution growth method. The results of magnetic characterization show that, due to uncompensated spins, NiO nanocrystals with a size less than 12.8 nm exhibit a very weak ferromagnetic state at room temperature.

UiTM’s electrical engineers’ novel nickel oxide nano carnation package won the MTE 2020 Gold Award and International Merit Award

The electrical engineering lecturer of Teknologi MARA University (UiTM) Malaysia became a gold medalist at the recent Malaysia Technology Expo (MTE) 2020. Their project is called “Humidity Sensor Based on New Nickel Oxide Nano-Carnation Structure Synthesized by Low-Temperature Immersion Method”. Dr. Assoc. Mohamad Hafiz Mamat also won the 2020 Malaysia Technology Expo (MTE) International Merit Award.

The present invention proposes the manufacture of a humidity sensor based on nickel oxide nanostructures on cheap glass or flexible substrates. The made sensor has excellent sensitivity to humidity or water molecules. Use the solution immersion method to manufacture sensors at low temperatures.

MTE, held annually since 2001, has become one of the most recognized international invention exhibitions. This year, MTE is managed by PROTEMP Group, University of Malacca Malaysia (UTEM) and SIRIM Tech Venture Sdn. SIRIM Tech Venture Sdn Bhd. It is a subsidiary of SIRIM Berhad, which provides commercial services for innovations generated by research and development (R&D) activities in Malaysia. During the three-day exhibition, more than 500 local and international inventions were exhibited.

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