TY - JOUR
T1 - Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni81 Fe19 α Fe2 O3
AU - Dho, Joonghoe
AU - Leung, Chi Wah
AU - Barber, Z. H.
AU - Blamire, M. G.
PY - 2005/12/14
Y1 - 2005/12/14
N2 - We report anisotropy, coercivity, and exchange bias in ferromagnetic Ni81 Fe19 layers coupled to antiferromagnetic (AF) (0001), (11 2̄ 0), and (11 0̄ 2) α Fe2 O3 layers. We show that AF spin configurations which permit spin-flop coupling give rise to a strong uniaxial anisotropy and hence a large coercivity, and that by annealing in magnetic fields parallel to specific directions in the AF we can control either coercivity or exchange bias. In particular, we show that a reversible temperature-induced spin reorientation in the AF can be used to control the exchange interaction.
AB - We report anisotropy, coercivity, and exchange bias in ferromagnetic Ni81 Fe19 layers coupled to antiferromagnetic (AF) (0001), (11 2̄ 0), and (11 0̄ 2) α Fe2 O3 layers. We show that AF spin configurations which permit spin-flop coupling give rise to a strong uniaxial anisotropy and hence a large coercivity, and that by annealing in magnetic fields parallel to specific directions in the AF we can control either coercivity or exchange bias. In particular, we show that a reversible temperature-induced spin reorientation in the AF can be used to control the exchange interaction.
UR - http://www.scopus.com/inward/record.url?scp=28644447783&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.71.180402
DO - 10.1103/PhysRevB.71.180402
M3 - Journal article
SN - 1098-0121
VL - 71
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 18
M1 - 180402
ER -