Exploring the full magneto-ionic oxidation spectrum in Pt/CoFeB/HfO2
Abstract
We show that in Pt/CoFeB/HfO2 a wide range of oxidation levels at the ferromagnet/oxide interface can be accessed through magneto-ionic gating using ionic liquid gates. Perpendicular magnetic anisotropy (PMA) is induced at intermediate oxidation levels, while two in-plane anisotropy states with nonequivalent ionic states are induced for under-oxidized and over-oxidized interfaces. This system shows reversibility and non-volatility in the whole range of oxidation states, where oxidation levels have been monitored by x-ray absorption spectroscopy and x-ray photoelectron spectroscopy. This study shows that multistate magneto-ionic memory elements with a wider range of intermediate states can be designed by leveraging both under- and over-oxidation around the optimal oxidation state that induces PMA.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (18)
I. Benguettat-El Mokhtari
Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay 1 , 91120 Palaiseau,
R. Pachat
Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay 1 , 91120 Palaiseau,
V. Porée
Synchrotron SOLEIL 2 , L'Orme des Merisiers, 91190 Saint-Aubin,
A. Lamperti
CNR-IMM, Agrate Unit Via C. Olivetti 3 , 2-20864 Agrate Brianza (MB),
Y. Roussigné
Laboratoire des Sciences des Procédés et des Matériaux, CNRS-UPR 3407, Université Sorbonne Paris Nord 4 , 93430 Villetaneuse,
M.-A. Syskaki
Singulus Technologies AG 2 , Hanauer Landstrasse 103, 63796 Kahl am Main,
J. Wrona
Singulus Technologies AG 5 , Hanauer Landstrasse 103, 63796 Kahl am Main,
G. Bernard
Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies 1 , Palaiseau,
A. Cataldo
CNR-IMM, Agrate Unit Via C. Olivetti 3 , 2-20864 Agrate Brianza (MB),
A. Resta
Synchrotron SOLEIL 2 , L'Orme des Merisiers, 91190 Saint-Aubin,
A. Nicolaou
Synchrotron SOLEIL 2 , L'Orme des Merisiers, 91190 Saint-Aubin,
S. Ono
Central Research Institute of Electric Power Industry 6 , Yokosuka, Kanagawa 240-0196,
S. M. Chérif
Laboratoire des Sciences des Procédés et des Matériaux, CNRS-UPR 3407, Université Sorbonne Paris Nord 4 , 93430 Villetaneuse,
J. Langer
D. Ravelosona
Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay 1 , 91120 Palaiseau,
M. Belmeguenai
Laboratoire des Sciences des Procédés et des Matériaux, CNRS-UPR 3407, Université Sorbonne Paris Nord 4 , 93430 Villetaneuse,
A. Solignac
SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 7 91191 Gif-sur-Yvette Cedex,
L. Herrera Diez
Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies 1 , Palaiseau,