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Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)

Current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) read sensors based on Heusler alloys are promising candidates for ultrahigh areal densities of magnetic data storage technology. In particular, the thickness of reader structures is one of the key factors for the development of pra...

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Autores principales: Khunkitti, Pirat, Siritaratiwat, Apirat, Pituso, Kotchakorn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8467614/
https://www.ncbi.nlm.nih.gov/pubmed/34577654
http://dx.doi.org/10.3390/mi12091010
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author Khunkitti, Pirat
Siritaratiwat, Apirat
Pituso, Kotchakorn
author_facet Khunkitti, Pirat
Siritaratiwat, Apirat
Pituso, Kotchakorn
author_sort Khunkitti, Pirat
collection PubMed
description Current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) read sensors based on Heusler alloys are promising candidates for ultrahigh areal densities of magnetic data storage technology. In particular, the thickness of reader structures is one of the key factors for the development of practical CPP-GMR sensors. In this research, we studied the dependence of the free layer thickness on the stability of the Co(2)(Mn(0.6)Fe(0.4))Ge Heusler-based CPP-GMR read head for an areal density of 1 Tb/in(2), aiming to determine the appropriate layer thickness. The evaluations were done through simulations based on micromagnetic modelling. The reader stability indicators, including the magnetoresistance (MR) ratio, readback signal, dibit response asymmetry parameter, and power spectral density profile, were characterized and discussed. Our analysis demonstrates that the reader with a free layer thickness of 3 nm indicates the best stability performance for this particular head. A reasonably large MR ratio of 26% was obtained by the reader having this suitable layer thickness. The findings can be utilized to improve the design of the CPP-GMR reader for use in ultrahigh magnetic recording densities.
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spelling pubmed-84676142021-09-27 Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2) Khunkitti, Pirat Siritaratiwat, Apirat Pituso, Kotchakorn Micromachines (Basel) Article Current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) read sensors based on Heusler alloys are promising candidates for ultrahigh areal densities of magnetic data storage technology. In particular, the thickness of reader structures is one of the key factors for the development of practical CPP-GMR sensors. In this research, we studied the dependence of the free layer thickness on the stability of the Co(2)(Mn(0.6)Fe(0.4))Ge Heusler-based CPP-GMR read head for an areal density of 1 Tb/in(2), aiming to determine the appropriate layer thickness. The evaluations were done through simulations based on micromagnetic modelling. The reader stability indicators, including the magnetoresistance (MR) ratio, readback signal, dibit response asymmetry parameter, and power spectral density profile, were characterized and discussed. Our analysis demonstrates that the reader with a free layer thickness of 3 nm indicates the best stability performance for this particular head. A reasonably large MR ratio of 26% was obtained by the reader having this suitable layer thickness. The findings can be utilized to improve the design of the CPP-GMR reader for use in ultrahigh magnetic recording densities. MDPI 2021-08-25 /pmc/articles/PMC8467614/ /pubmed/34577654 http://dx.doi.org/10.3390/mi12091010 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Khunkitti, Pirat
Siritaratiwat, Apirat
Pituso, Kotchakorn
Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)
title Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)
title_full Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)
title_fullStr Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)
title_full_unstemmed Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)
title_short Free Layer Thickness Dependence of the Stability in Co(2)(Mn(0.6)Fe(0.4))Ge Heusler Based CPP-GMR Read Sensor for Areal Density of 1 Tb/in(2)
title_sort free layer thickness dependence of the stability in co(2)(mn(0.6)fe(0.4))ge heusler based cpp-gmr read sensor for areal density of 1 tb/in(2)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8467614/
https://www.ncbi.nlm.nih.gov/pubmed/34577654
http://dx.doi.org/10.3390/mi12091010
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