TY - JOUR
T1 - Investigation of perpendicular magnetic anisotropy in Pt/Co20Fe60B20/Pt multi-layer structures
AU - Cestarollo, Ludovico
AU - Srinivasan, Karthik
AU - El-Ghazaly, Amal
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11/15
Y1 - 2022/11/15
N2 - Multi-layers of Co20Fe60B20 and Pt with large perpendicular magnetic anisotropies (PMA), comparable to those obtained with the more widely utilized Ta/CoFeB/MgO heterostructures, are reported. CoFeB thickness of approximately 0.8 nm is necessary to maximize PMA in Pt/CoFeB/Pt. Strong PMA can only be obtained upon careful tuning of the material the CoFeB layer is deposited on. Specifically, a Pt layer thickness of at least 3 nm is necessary to obtain PMA in CoFeB due to the emergence of (111) texture in thicker Pt films. The absence of a magnetic dead layer at the interface between CoFeB and Pt (as opposed to an interface between CoFeB and Ta) maximizes the amount of magnetic content per unit volume. Furthermore, this study investigates the magnetic properties of multi-layer structures where four CoFeB layers are deposited between Pt and Pt/Ta/Pt buffers. While the out-of-plane remanent magnetization of the structures is low, they present small nucleation field down to 30 Oe and large anisotropy energy in the range of 106 erg/cc.
AB - Multi-layers of Co20Fe60B20 and Pt with large perpendicular magnetic anisotropies (PMA), comparable to those obtained with the more widely utilized Ta/CoFeB/MgO heterostructures, are reported. CoFeB thickness of approximately 0.8 nm is necessary to maximize PMA in Pt/CoFeB/Pt. Strong PMA can only be obtained upon careful tuning of the material the CoFeB layer is deposited on. Specifically, a Pt layer thickness of at least 3 nm is necessary to obtain PMA in CoFeB due to the emergence of (111) texture in thicker Pt films. The absence of a magnetic dead layer at the interface between CoFeB and Pt (as opposed to an interface between CoFeB and Ta) maximizes the amount of magnetic content per unit volume. Furthermore, this study investigates the magnetic properties of multi-layer structures where four CoFeB layers are deposited between Pt and Pt/Ta/Pt buffers. While the out-of-plane remanent magnetization of the structures is low, they present small nucleation field down to 30 Oe and large anisotropy energy in the range of 106 erg/cc.
KW - CoFeB
KW - Magnetic properties
KW - Magnetic thin films
KW - PMA
KW - Pt
KW - Sputtering
UR - http://www.scopus.com/inward/record.url?scp=85136625716&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2022.169825
DO - 10.1016/j.jmmm.2022.169825
M3 - Article
AN - SCOPUS:85136625716
SN - 0304-8853
VL - 562
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
M1 - 169825
ER -