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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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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Insulating Nanomagnets Driven by Spin Torque.

Matthias B Jungfleisch1, Junjia Ding1, Wei Zhang1,2

  • 1Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.

Nano Letters
|January 12, 2017
PubMed
Summary
This summary is machine-generated.

Yttrium iron garnet (Y3Fe5O12)/Pt nanowires exhibit spin dynamics driven by spin-torque ferromagnetic resonance. These results pave the way for ultralow power spintronic devices and integrated magnonic logic.

Keywords:
Spin-torque ferromagnetic resonancemagnetization dynamicsplatinumspin-Hall effectspin-transfer torqueyttrium iron garnet

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic insulators like Yttrium Iron Garnet (Y3Fe5O12) are crucial for low-power spintronics due to efficient spin current handling.
  • Spin-Hall effects effectively drive spin dynamics in Y3Fe5O12/Pt heterostructures at the micrometer scale.

Purpose of the Study:

  • To excite and detect spin dynamics in Y3Fe5O12/Pt nanowires using spin-torque ferromagnetic resonance.
  • To investigate the influence of Oersted fields and spin-Hall torques on magnetization precession.
  • To explore the impact of geometrical confinement and heating effects on spin dynamics in nanostructures.

Main Methods:

  • Fabrication of Y3Fe5O12/Pt nanowires via electron-beam lithography and sputtering deposition.
  • Utilizing spin-torque ferromagnetic resonance for excitation and detection of spin dynamics.
  • Systematic examination of nanowires across various frequencies, power ranges, and widths.

Main Results:

  • Observation of field-like and antidamping-like torques resulting from combined Oersted and spin-Hall effects.
  • Significant changes in resonance field at high microwave powers attributed to heating-induced reduction in effective magnetization.
  • Evidence of quantized spin-wave modes across nanowire widths, highlighting the role of geometrical confinement.

Conclusions:

  • Demonstrated effective excitation and detection of spin dynamics in Y3Fe5O12/Pt nanowires.
  • Highlighted the pronounced heating effects and geometrical confinement importance in nanostructures.
  • Established a foundation for developing integrated magnonic logic devices utilizing insulating nanomagnets.