Origin of variation of shift field via annealing at 400°C in a perpendicular-anisotropy magnetic tunnel junction with [Co/Pt]-multilayers based synthetic ferrimagnetic reference layer

H. Honjo; S. Ikeda; H. Sato; T. Watanebe; S. Miura; T. Nasuno; Y. Noguchi; M. Yasuhira; T. Tanigawa; H. Koike; M. Muraguchi; M. Niwa; K. Ito; H. Ohno; T. Endoh

doi:10.1063/1.4973946

Origin of variation of shift field via annealing at 400°C in a perpendicular-anisotropy magnetic tunnel junction with [Co/Pt]-multilayers based synthetic ferrimagnetic reference layer

H. Honjo, S. Ikeda, H. Sato, T. Watanebe, S. Miura, T. Nasuno, Y. Noguchi, M. Yasuhira, T. Tanigawa, H. Koike, M. Muraguchi, M. Niwa, K. Ito, H. Ohno, T. Endoh

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Abstract

We investigated properties of perpendicular-anisotropy magnetic tunnel junctions (p-MTJs) with [Co/Pt]-multilayer based synthetic ferrimagnetic reference (SyF) layer at elevated annealing temperature T_a from 350°C to 400°C. Shift field H_S defined as center field of minor resistance versus magnetic field curve of the MTJs increased with increase of T_a from 350°C to 400°C. The variation of H_S is attributed to the variation of saturation magnetic moment in the SyF reference layer. Cross sectional energy dispersive X-ray spectroscopy analysis revealed that Fe element of CoFeB in the reference layer diffuses to Co/Pt multilayers in the SyF reference layer.

Original language	English
Article number	055913
Journal	AIP Advances
Volume	7
Issue number	5
DOIs	https://doi.org/10.1063/1.4973946
Publication status	Published - 2017 May 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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Honjo, H., Ikeda, S., Sato, H., Watanebe, T., Miura, S., Nasuno, T., Noguchi, Y., Yasuhira, M., Tanigawa, T., Koike, H., Muraguchi, M., Niwa, M., Ito, K., Ohno, H., & Endoh, T. (2017). Origin of variation of shift field via annealing at 400°C in a perpendicular-anisotropy magnetic tunnel junction with [Co/Pt]-multilayers based synthetic ferrimagnetic reference layer. AIP Advances, 7(5), [055913]. https://doi.org/10.1063/1.4973946

Honjo, H , Ikeda, S, Sato, H, Watanebe, T, Miura, S, Nasuno, T, Noguchi, Y, Yasuhira, M, Tanigawa, T, Koike, H, Muraguchi, M, Niwa, M, Ito, K, Ohno, H & Endoh, T 2017, 'Origin of variation of shift field via annealing at 400°C in a perpendicular-anisotropy magnetic tunnel junction with [Co/Pt]-multilayers based synthetic ferrimagnetic reference layer', AIP Advances, vol. 7, no. 5, 055913. https://doi.org/10.1063/1.4973946

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title = "Origin of variation of shift field via annealing at 400°C in a perpendicular-anisotropy magnetic tunnel junction with [Co/Pt]-multilayers based synthetic ferrimagnetic reference layer",

abstract = "We investigated properties of perpendicular-anisotropy magnetic tunnel junctions (p-MTJs) with [Co/Pt]-multilayer based synthetic ferrimagnetic reference (SyF) layer at elevated annealing temperature Ta from 350°C to 400°C. Shift field HS defined as center field of minor resistance versus magnetic field curve of the MTJs increased with increase of Ta from 350°C to 400°C. The variation of HS is attributed to the variation of saturation magnetic moment in the SyF reference layer. Cross sectional energy dispersive X-ray spectroscopy analysis revealed that Fe element of CoFeB in the reference layer diffuses to Co/Pt multilayers in the SyF reference layer.",

author = "H. Honjo and S. Ikeda and H. Sato and T. Watanebe and S. Miura and T. Nasuno and Y. Noguchi and M. Yasuhira and T. Tanigawa and H. Koike and M. Muraguchi and M. Niwa and K. Ito and H. Ohno and T. Endoh",

note = "Funding Information: This work is supported by CIES's Industrial Affiliation on STT MRAM program and ACCEL under JST. Publisher Copyright: {\textcopyright} 2017 Author(s).",

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AU - Honjo, H.

AU - Ikeda, S.

AU - Sato, H.

AU - Watanebe, T.

AU - Miura, S.

AU - Nasuno, T.

AU - Noguchi, Y.

AU - Yasuhira, M.

AU - Tanigawa, T.

AU - Koike, H.

AU - Muraguchi, M.

AU - Niwa, M.

AU - Ito, K.

AU - Ohno, H.

AU - Endoh, T.

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Origin of variation of shift field via annealing at 400°C in a perpendicular-anisotropy magnetic tunnel junction with [Co/Pt]-multilayers based synthetic ferrimagnetic reference layer

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