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Related Concept Videos

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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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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Color in Coordination Complexes
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Interfacial exchange coupling and magnetization reversal in perpendicular [Co/Ni]N/TbCo composite structures.

M H Tang1, Zongzhi Zhang1, S Y Tian2

  • 1Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China.

Scientific Reports
|June 16, 2015
PubMed
Summary
This summary is machine-generated.

We investigated interfacial exchange coupling in ferrimagnetic/ferromagnetic heterostructures. Tuning layer structure achieved high switching and coupling fields, crucial for advanced magnetic recording technologies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Investigating interfacial exchange coupling is key for developing advanced magnetic storage devices.
  • Understanding magnetization reversal in complex heterostructures is crucial for device performance.

Purpose of the Study:

  • To explore interfacial exchange coupling and magnetization reversal in TbCo/ [Co/Ni]N heterostructures.
  • To analyze the influence of layer composition and magnetic properties on coupling behavior.
  • To optimize heterostructures for high switching and coupling fields.

Main Methods:

  • Fabrication of amorphous ferrimagnetic (FI) TbₓCo(100-x) alloy layers exchange-coupled with ferromagnetic (FM) [Co/Ni]N multilayers.
  • Characterization of magnetization compensation composition shifts.
  • Measurement of net magnetization switching field (Hc⊥) and interlayer interfacial coupling field (Hex).

Main Results:

  • Magnetization compensation composition shifts to higher Tb content in heterostructures.
  • Switching and coupling fields are sensitive to layer magnetization, thickness, and perpendicular magnetic anisotropy.
  • Achieved high Hc⊥ = 1.31 T and Hex = 2.19 T by tuning layer structure.

Conclusions:

  • Co/Ni layers compensate Tb moments in TbCo layers, shifting compensation composition.
  • Interfacial coupling is strongly influenced by individual layer properties and anisotropy.
  • Optimized FM/FI heterostructures show potential for heat-assisted magnetic recording and all-optical switching applications.