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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
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Intensidad mínima de campo en la reversión de la magnetización precesional.

Back1, Allenspach, Weber

  • 1Laboratorium fur Festkorperphysik, ETH Zurich, CH-8093 Zurich, Switzerland. IBM Research Division, Zurich Research Laboratory, CH-8803 Ruschlikon, Switzerland. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA.

Science (New York, N.Y.)
|August 7, 1999
PubMed
Resumen

Los pulsos de campo magnético ultrarrápidos pueden revertir la magnetización en las películas de cobalto. Este descubrimiento allana el camino para tecnologías de grabación magnética más rápidas.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales ciencia de los materiales.

Sus antecedentes:

  • La inversión de la magnetización es crucial para el almacenamiento de datos magnéticos.
  • El control de la dinámica de magnetización en escalas de tiempo ultrarrápidas es un desafío continuo.

Objetivo del estudio:

  • Investigar la viabilidad de la inversión de la magnetización ultrarrápida utilizando pulsos de campo magnético de picosegundos.
  • Para determinar las condiciones óptimas para desencadenar la inversión de magnetización con una intensidad de campo mínima.

Principales métodos:

  • Aplicando pulsos de campo magnético en el plano tan cortos como 2 picosegundos a películas delgadas de cobalto.
  • Variando la dirección de los pulsos del campo magnético en relación con la magnetización.

Principales resultados:

  • La inversión de la magnetización se logró utilizando pulsos de campo magnético de 2 picosegundos.
  • El par máximo, que lleva a la inversión de precesión, se produjo cuando el campo era perpendicular a la magnetización.
  • Se demostró una inversión efectiva con campos tan bajos como 184 kiloamperios por metro.

Conclusiones:

  • Los pulsos de campo magnético de picosegundos son capaces de una inversión de magnetización ultrarrápida en las películas de cobalto.
  • El estudio destaca el potencial para desarrollar tecnologías avanzadas de grabación magnética de alta velocidad.