EurekAlert February 8, 2021 An international team of researchers ( UK, Uzbekistan, Russia, France, USA – Oak Ridge National Laboratory, Vietnam, South Korea, Czech Republic) was able to control the conductivity and magnetism of iron thiophosphate (FePS3) which undergoes a transition from an insulator to a metal when compressed. Using new techniques to measure the magnetic structure up to record-breaking high pressures, they found that magnetism survives, but gets modified into new forms, giving rise to new quantum properties in a new type of magnetic metal. The ‘spin’ of the electrons has been shown to be the source of magnetism. […]
Tag Archives: Magnetism
Physicists Observe Trippy ‘Vortex Rings’ in a Magnetic Material For The First Time
Science Alert December 1, 2020 Magnetic ring vortices were predicted over 20 years ago in 1998. An international team of researchers (UK, Switzerland, Ukraine, Russia) have found vortex rings inside a tiny pillar made of the magnetic material gadolinium-cobalt intermetallic compound GdCo2. They developed an X-ray nanotomography technique to image the three-dimensional magnetization structure inside a GdCo2 bulk magnet. The vortices were paired with their topological counterparts, antivortices. They also found closed magnetic loops present in vortex-antivortex pairs. After computationally analysing these structures in the context of magnetic vorticity they figured out these were doughnut-shaped ring vortices, intersected by magnetization […]
Physicists circumvent centuries-old theory to cancel magnetic fields
Phys.org October 28, 2020 Controlling magnetism, essential for a wide range of technologies, is impaired by the impossibility of generating a maximum of magnetic field in free space. An international team of researchers (Spain, Italy, UK) circumvented the limits to shape magnetic fields by creating a device comprised of a careful arrangement of electrical wires. This creates additional fields that counter act the effects of the unwanted magnetic field. While a similar effect has been achieved at much higher frequencies, this team has achieved the same at low frequencies and static fields—such as biological frequencies—which will unlock a host of useful […]
An electrical switch for magnetism
Phys.org August 6, 2020 Electrical control of magnetism in van der Waals ferromagnetic semiconductors is an important step in creating novel spintronic devices capable of processing and storing information. Using an electric double-layer transistor device, an international team of researchers (Singapore, UK, China) discovered that the magnetism of a magnetic semiconductor, Cr2Ge2Te6, shows exceptionally strong response to applied electric fields. With electric fields applied, the material was found to exhibit ferromagnetism at temperatures up to 200 K (-73°C). At such temperatures, ferromagnetic order is normally absent in this material. Their analysis suggests that heavy doping promotes a double-exchange mechanism that […]
Taking magnetism for a spin: exploring the mysteries of skyrmions
Nanowerk January 23, 2019 Until recently skyrmions were a phenomenon only observed at extreme low temperature. They need external magnetic fields to exist. A team of researchers in the US (Ames Laboratory, Oak Ridge National Laboratory, University of Florida) established a skyrmion lattice in a sample through exposure to magnetic fields and supercooling with liquid nitrogen. They were able to observe the skyrmion lattice in zero magnetic field, and then observe the decay of the skyrmions as the temperature warmed gaining critical new information about how skyrmions behave and how they revert to metastable state. The research provides a very solid […]
Scientists predict superelastic properties in a group of iron-based superconductors
Science Daily August 30, 2018 By performing pressure simulations within density functional theory for the family of iron-based superconductors an international team of researchers (Germany, USA – Iowa State University) predicts that in these systems the appearance of two consecutive half-collapsed tetragonal transitions at pressures Pc1and Pc2. They identify clear trends of critical pressures and discuss the relevance of the collapsed phases in connection to magnetism and superconductivity. Not only does this study have implications for properties of magnetism and superconductivity, it may have much wider application in room-temperature elasticity… read more. TECHNICAL ARTICLE
Scientists find ordered magnetic patterns in disordered magnetic material
Science Daily June 8, 2018 A team of researchers in the US (Lawrence Berkeley National Laboratory, UC Berkeley) has generalized the concept of chirality driven by interfacial the Dzyaloshinskii–Moriya interaction (DMI) to complex multicomponent systems and demonstrated on the example of chiral ferrimagnetism in amorphous GdCo films. They found that 2 nm thick GdCo films preserve ferrimagnetism and stabilize chiral domain walls. The type of chiral domain walls depends on the rare‐earth composition/saturation magnetization. The success of the experiments opens the possibility of controlling some properties of domain walls, such as chirality, with temperature, and of switching a material’s chiral […]