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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
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Torque Free Motion01:15

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Net Torque Calculations01:19

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Related Experiment Video

Updated: Jan 30, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
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A cryogenic spin-torque memory element with precessional magnetization dynamics.

G E Rowlands1, C A Ryan2, L Ye3

  • 1Raytheon BBN Technologies, Cambridge, MA, 02138, USA. graham.rowlands@raytheon.com.

Scientific Reports
|January 30, 2019
PubMed
Summary
This summary is machine-generated.

Precessional spin-torque devices show fast, reliable magnetization switching at low temperatures. Out-of-plane spin polarization dominates dynamics, enabling cryogenic applications.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Orthogonal spin-torque spin-valve devices are crucial for magnetic memory technologies.
  • Understanding magnetization switching dynamics is key to improving device performance.

Purpose of the Study:

  • To investigate precessional magnetization switching in orthogonal spin-torque spin-valve devices at low temperatures.
  • To identify the dominant spin-polarization mechanism influencing switching dynamics.

Main Methods:

  • Fabrication of spin-valve devices with out-of-plane magnetized polarizing layer and in-plane magnetized free/reference layers.
  • Low-temperature experimental characterization of magnetization switching.
  • Analysis of switching probability over a wide parameter space (pulse amplitude and duration).

Main Results:

  • Observed coherent oscillations in switching probability.
  • Achieved high-speed switching (~200 ps) with low error rates (as low as 10^-5).
  • Identified decoherence effects at longer timescales (~1 ns).
  • Demonstrated dominance of out-of-plane spin polarization over in-plane spin-torque.

Conclusions:

  • Precessional spin-torque devices exhibit efficient and coherent switching at cryogenic temperatures.
  • Out-of-plane spin polarization is the primary driver of switching dynamics in this configuration.
  • These devices show promise for applications in cryogenic environments, unlike room-temperature performance.