TY - JOUR
T1 - Spin Reversal Mechanism of a Perpendicular Exchange Bias System with an Antiferromagnet Incorporating a Parasitic Ferromagnetism
AU - Ye, Shujun
AU - Shiokawa, Yohei
AU - Pati, Satya P.
AU - Sahashi, Masashi
N1 - Funding Information:
This work was partly funded by the ImPACT Program of the Council for Science, Technology and Innovation (Cabinet Office, Japanese Government).
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/8
Y1 - 2019/8
N2 - Aluminum doping produced the parasitic magnetization (Mpara) with high coercivity in 20 nm thin antiferromagnetic Cr2O3 films. By using the large coercive force of Mpara, whose direction is the same as the antiferromagnetic Cr2O3 surface spin, antiferromagnetic spin reversal can be detected through the vertical shift of the hysteresis loop of an antiferromagnetic-Cr2O3/ferromagnet perpendicular exchange bias (PEB) coupling system. By analyzing both antiferromagnetic and ferromagnetic spin reversals in response to external magnetic field and temperature, each spin reversal mechanism in a PEB system is clarified. It is found that the competition among Zeeman energy due to Mpara, exchange coupling energy, and antiferromagnetic anisotropy energy decides the antiferromagnetic spin direction and, accordingly, PEB sign under different cooling fields, different temperatures, and different swept magnetic fields for PEB systems. This work might contribute to a deep understanding of spin reversal mechanism in a perpendicular exchange bias system.
AB - Aluminum doping produced the parasitic magnetization (Mpara) with high coercivity in 20 nm thin antiferromagnetic Cr2O3 films. By using the large coercive force of Mpara, whose direction is the same as the antiferromagnetic Cr2O3 surface spin, antiferromagnetic spin reversal can be detected through the vertical shift of the hysteresis loop of an antiferromagnetic-Cr2O3/ferromagnet perpendicular exchange bias (PEB) coupling system. By analyzing both antiferromagnetic and ferromagnetic spin reversals in response to external magnetic field and temperature, each spin reversal mechanism in a PEB system is clarified. It is found that the competition among Zeeman energy due to Mpara, exchange coupling energy, and antiferromagnetic anisotropy energy decides the antiferromagnetic spin direction and, accordingly, PEB sign under different cooling fields, different temperatures, and different swept magnetic fields for PEB systems. This work might contribute to a deep understanding of spin reversal mechanism in a perpendicular exchange bias system.
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U2 - 10.1002/pssr.201900135
DO - 10.1002/pssr.201900135
M3 - Letter
AN - SCOPUS:85065524122
VL - 13
JO - Physica Status Solidi - Rapid Research Letters
JF - Physica Status Solidi - Rapid Research Letters
SN - 1862-6254
IS - 8
M1 - 1900135
ER -