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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.9K
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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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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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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Updated: Dec 26, 2025

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Flexible Antiferromagnetic FeRh Tapes as Memory Elements.

Ignasi Fina1, Nico Dix1, Enric Menéndez2

  • 1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, E-08193 Bellaterra, Catalonia, Spain.

ACS Applied Materials & Interfaces
|March 10, 2020
PubMed
Summary
This summary is machine-generated.

Flexible iron-rhodium (FeRh) films exhibit a sharp magnetic transition above room temperature, suitable for spintronics. These FeRh tapes maintain magnetic properties under bending, demonstrating potential for robust data storage applications.

Keywords:
FeRhantiferromagnetic spintronicsflexible electronicsflexible magnetsthin films

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spintronics

Background:

  • Iron-rhodium (FeRh) exhibits a phase transition from antiferromagnetic to ferromagnetic state above room temperature.
  • This transition is of significant interest for spintronics applications, particularly for data storage.

Purpose of the Study:

  • To develop flexible FeRh films on a metallic substrate for large-scale spintronics applications.
  • To investigate the magnetic properties and data writing/reading capabilities of these flexible FeRh films.

Main Methods:

  • Growth of FeRh films on a flexible metallic tape substrate coated with a textured MgO layer.
  • Characterization of the antiferromagnetic to ferromagnetic transition temperature.
  • Assessment of magnetic property retention under mechanical bending.
  • Measurement of anisotropic magnetoresistance for data storage demonstration.

Main Results:

  • Successful fabrication of FeRh films on a flexible tape substrate with a textured MgO layer.
  • Observation of a sharp antiferromagnetic to ferromagnetic transition at approximately 90 °C.
  • Preservation of magnetic properties upon bending to radii of 300 mm.
  • Demonstration of data writing/reading capability using anisotropic magnetoresistance up to 0.05%.

Conclusions:

  • Flexible FeRh tapes are suitable for large-scale spintronics applications.
  • The material exhibits robust magnetic properties and potential for untraceable data storage.
  • The demonstrated anisotropic magnetoresistance confirms its utility for data manipulation.