Propiedades magnetoeléctricas de una memoria magnetorresistiva basada en películas de FeCoNi/TiN/FeCoNi

[ES] Se ha diseñado un dispositivo de memoria para la grabación y lectura de información basado en el efecto de la anisotropía magnetorresistiva de una multicapa fabricada por sputtering mediante diodo de rf. El elemento de memoria se compone de tres películas delgadas, de composición Fe15Co20Ni65(160Å)/ TiN(50Å)/Fe15Co20Ni65(160Å). El dispositivo permite procesos de grabación y lectura estables, y se compone de 32 elementos de memoria rectangulares por columna, donde cada elemento tiene dimensiones de ¿m lo que permite la fabricación de memorias integradas con capacidades del orden de 106 bits. Se han ensayado elementos de memoria rectangulares de diferentes tamaños, con las esquinas redondeadas con objeto de conseguir procesos de lectura-escritura lo más estable posible. Se han analizado comparativamente los efectos de magnetorresistencia y magnetoimpedancia de los elementos de memoria de diferentes dimensiones. Sugerimos que la disminución del valor absoluto de la magnetoimpedancia del elemento de memoria es consecuencia de la reducción de la parte real, de origen magnetorresistivo.[EN] A miniaturised memory device for information recording and readout processes have been designed on the basis of anisotropic magnetoresistive effect in Fe15Co20Ni65(160Å)/ TiN(50Å)/Fe15Co20Ni65(160Å) three-layered film done by rf diode sputtering. Stable recording and readout processes were available for 32 rectangular element column, where each element had ¿m dimensions convenient to fabricate memory chip with 106 bits capacity. Rectangles of different sizes with removed corners were used in order to define the geometry of most of all stable recording and readout processes. Magnetoresistance and magnetoimpedance effects of a magnetic memory device have been comparatively analysed. We suggest that the decrease of the absolute value of the magnetoimpedance of the memory device comes from the reduction of the real part via the magnetoresistance.Dr. G.V.Kurlyandskaya acknowledges the financial support of the Basque Government. The work has been supported by the Basque Government under the project N PI97/113 and Spanish CICYT under project MAT-98/965. We thank J. L. Muñoz for helpful discussion.Kurlyandskaya, G.; Barandiarán García, JM.; García Miquel, ÁH.; Vázquez Vilalabeitia, M.; Vaskovskiy, V.; Svalov, A. (2000). High frequency and magnetoelectrical properties of magnetoresistive memory element based on FeCoNi/TiN/FeCoNi film. Boletín de la Sociedad Española de Cerámica y Vidrio. 39(4):581-583. https://doi.org/10.3989/cyv.2000.v39.i4.824S58158339

Magnetic bistability of NiFeCo electroplated wires

[EN] Fe20Ni74Co6 and Fe20Ni64Co16 magnetic tubes electroplated onto Cu98Be2 conductive wire were investigated in the as-prepared state after heat treatment under a longitudinal DC magnetic field for 1 h at 300 degreesC or 330 degreesC and after deposition of an additional FeNi layer by rf-sputtering in order to receive a hysteresis loop as squarelike as possible and a bistable magnetic state. Heat treatments modify the shape of hysteresis loops. Magnetically bistable behavior is observed after the field annealing at a temperature of 330 degreesC. The bistable behavior of these wires is promising in technological application; it has never been observed before in electroplated wires.S12512891Supl.

Longitudinal magnetic bistability of electroplated wires

[EN] Fe20Ni74Co6 and Fe20Ni64Co16 1 mum thick magnetic tubes electroplated onto Cu98Be2 conductive wire have been investigated in as-deposited state, after heat treatment under longitudinal magnetic field for 1 h at 330degreesC, and after rf-sputtering deposition of the additional 2 mum Fe19Ni81 layer. Heat treatments and an additional layer deposition modify the shape of hysteresis loops. Magnetically bistable behaviour, observed after the field annealing at a temperature of 330degreesC, is studied as a function of the length of the samples. This is the first report by our knowledge on the bistable behaviour of the electroplated wires. The bistability of these wires is promising for applications such as tagging or pulse generator applications. (C) 2002 Elsevier Science B.V. All rights reserved.G.V. Kurlyandskaya thanks The Basque Country University for the visiting professor invitation. We thank Prof. J.M. Barandiaran and Dr. J.L. Munoz for helpful discussion. The research has been partially supported by Award No. REC-005 of the US Civilian Research & Development Foundation for the Independent States of the Former Soviet Union (CRDF).Kurlyandskaya, G.; García Miquel, ÁH.; Vázquez, M.; Svalov, A.; Vaskovskiy, V. (2002). Longitudinal magnetic bistability of electroplated wires. Journal of Magnetism and Magnetic Materials. 249(1):34-38. https://doi.org/10.1016/S0304-8853(02)00500-0S3438249