A collaboration of physicists and engineers has found a new way to control electron spins not with a magnetic field but with a mechanical oscillator. This demonstration of electron spin resonance that’s “shaken, not stirred” showed that an oscillator can drive the transitions of electron spins within defects commonly found in the crystal lattice of a diamond.
In a new effort to understand magnetism, a group...
In materials science, electric and magnetic...
A new technique that allows curved surfaces to...
Researchers from North Carolina State Univ. have, for the first time, integrated a material called bismuth ferrite (BFO) as a single crystal onto a silicon chip, opening the door to a new generation of multifunctional, smart devices. Integrating the BFO into the silicon substrate as a single crystal makes the BFO more efficient by limiting the amount of electric charge that “leaks” out of the BFO into the substrate.
Cooling systems generally rely on water pumped through pipes to remove unwanted heat. Now, researchers at Massachusetts Institute of Technology and in Australia have found a way of enhancing heat transfer in such systems by using magnetic fields, a method that could prevent hotspots that can lead to system failures. The system could also be applied to cooling everything from electronic devices to advanced fusion reactors, they say.
Scientists in Japan have recently shown that structural control of small magnetic vortex structures called skyrmions could lead to a compact, low-power alternative to conventional magnetic data storage. Skyrmions occur rarely in certain magnetic compounds, but after it was discovered that they can exist near room temperature and can be manipulated with little current, research interest has grown.
After more than 40 years of intense research, experimental physicists still seek to explore the rich behavior of electrons confined to a 2-D crystalline structure exposed to large magnetic fields. Now a team in Europe has developed a new experimental method to simulate these systems using a crystal made of neutral atoms and laser light.
A new study set out to use numerical simulations to validate previous theoretical predictions describing materials exhibiting so-called antiferromagneting characteristics. A recently discovered theory shows that the ordering temperature depends on two factors—namely the spin-wave velocity and the staggered magnetization. The simulations match these theoretical predictions.
Researchers have recently provided the first evidence ever that it is possible to generate a magnetic field by using heat instead of electricity. The phenomenon is referred to as the Magnetic Seebeck effect or “thermomagnetism”.
Using low-frequency laser pulses, a team of researchers has carried out the first measurements that reveal the detailed characteristics of a unique kind of magnetism found in a mineral called herbertsmithite. In this material, the magnetic elements constantly fluctuate, leading to an exotic state of fluid magnetism called a “quantum spin liquid.”
Just like people, materials can sometimes exhibit “multiple personalities.” This kind of unusual behavior in a certain class of materials has compelled researchers at Argonne National Laboratory to take a closer look at the precise mechanisms that govern the relationships between superconductivity and magnetism.
Researchers at North Carolina State Univ. have created a new compound, strontium tin oxide (Sr3SnO) that can be integrated into silicon chips and is a dilute magnetic semiconductor, meaning that it could be used to make “spintronic” devices, which rely on magnetic force to operate, rather than electrical currents.
Though nanosatellites already borrow several components, including cameras and radios, from terrestrial gadgets, propulsion systems have to be built from scratch. Researchers are working on electrospray ionic liquid “rockets”, but the microscopic needles they require are difficult and tedious to make. A researcher has found a way to let nature do the work, simplifying the fabrication process.
Researchers in Israel have developed a simple magnetization progress that depends on electron spin to eliminate the need for permanent magnets in memory devices. The new technique, called magnetless spin memory (MSM), drives a current through chiral material and selectively transfers electrons to magnetize nanomagnetic layers or nanoparticles.
What happens to a resonant wireless power transfer system in the presence of complex electromagnetic environments, such as metal plates? A team of researchers has explored the influences at play in this type of situation, and they describe how efficient wireless power transfer can be achieved in the presence of metal plates.
The smallest unit of a magnet is the magnetic moment of a single atom or ion. Researchers in Germany wanted to find out whether the magnetism of a pair of magnetic moments can be measured electrically in a single molecule. To do this, they succeeded in performing an extraordinary experiment which shows how magnetism that generally manifests itself by a force between two magnetized objects acts within a single molecule.
In the search for understanding how some magnetic materials can be transformed to carry electric current with no energy loss, scientists have used an experimental technique to measure the energy required for electrons to pair up and how that energy varies with direction. The method measures energy levels as small as one ten-thousandth the energy of a single light photon.
A research collaboration in Europe is the first to successfully create perfect 1-D molecular wires of which the electrical conductivity can almost entirely be suppressed by a weak magnetic field at room temperature. The underlying mechanism is possibly closely related to the biological compass used by some migratory birds to find their bearings in the geomagnetic field.
A research team has found superconductivity in the solid form of a compound called carbon disulfide, CS2, which is sometimes used in liquid form as a chemical solvent or insecticide. Superconductivity is usually present in highly ordered molecular structures, but in carbon disulfide, superconductivity arises from a highly disordered state, which is rare. Even more strange is the magnetic state that precedes superconductivity.
Materials scientists at the U.S. Dept. of Energy's Ames Laboratory have found an accurate way to explain the magnetic properties of a compound that has mystified the scientific community for decades. The compound of lanthanum, cobalt and oxygen (LaCoO3) has been a puzzle for over 50 years, due to its strange behavior.
A magnetic phenomenon newly discovered by Massachusetts Institute of Technology researchers could lead to much faster, denser and more energy-efficient chips for memory and computation. The findings could reduce the energy needed to store and retrieve one bit of data by a factor of 10,000.
Scientists on Long Island are preparing to move a 50-foot-wide electromagnet 3,200 miles over land and sea to its new home at the U.S. Department of Energy's Fermi National Accelerator Laboratory in Illinois. The trip, starting at Brookhaven National Laboratory, is expected to take more than a month.
Wonder material graphene can be made magnetic, and its magnetism can be switched on and off at the press of a button. This opens a new avenue towards electronics with very low energy consumption. In a report published by a Univ. of Manchester team shows how to create elementary magnetic moments in graphene and then switch them on and off. This is the first time magnetism itself has been toggled.
Scientists at Ames Laboratory have discovered a new family of rare-earth quasicrystals using an algorithm they developed to help pinpoint them. Quasicrystalline materials may be found close to crystalline phases that contain similar atomic motifs, called crystalline approximants. And just like fishing experts know how to hook a big catch, the scientists used their knowledge to hone in on the right spot for their discovery.
A team of researchers from Cologne, Munich and Dresden have managed to create artificial magnetic monopoles. To do this, the scientists merged tiny magnetic whirls, so-called skyrmions. At the point of merging, the physicists were able to create a monopole, which has similar characteristics to a fundamental particle postulated by Paul Dirac in 1931. In addition to fundamental research, the monopoles may also have application potential.
Researchers have developed a new way of controlling the motion of magnetic domains—the key technology in magnetic memory systems. The new approach requires little power to write and no power to maintain the stored information, and could lead to a new generation of extremely low-power data storage. It controls magnetism by applying a voltage, rather than a magnetic field.
Physicists understand perfectly well why a fridge magnet sticks to certain metallic surfaces. But there are more exotic forms of magnetism whose properties remain unclear, despite decades of intense research. Now, researchers at ETH Zurich in Switzerland have developed a quantum simulator that can arrange atoms in a way that they mimic the behavior of electrons in magnetic materials.
Magnetic memories store bits of information in discrete units whose electron spins all line up in parallel, pointing one way or the opposite to signify a one or a zero. At the Advanced Light Source, Lawrence Berkeley National Laboratory scientists recently joined an international team to advance a new concept in magnetic memory, one in which spin orientation is controlled in magnetic nanodisks, allowing multi-bit storage.
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