室温走査型マイクロ・ホール・プローブ顕微鏡による磁区観察

概要

論文の詳細を見る
A new versatile room temperature scanning Hall probe microscope system (RT-SHPM) was used for magnetic imaging of localised magnetic field fluctuations in close proximity to the surfaces of longitudinal magnetic recording media, low coercivity perpendicularly anisotropic iron garnet epitaxial layers, and demagnetized strontium ferrite permanent magnets placed in externally applied magnetic fields. Magnetic field fluctuations were sensed using an ultra-high sensitive sub-micron GaAs Hall probe with an active area of 〜0.8x0.8μm^2, room temperature Hall coefficient of 0.3Ω/G and field sensitivity of 0.04G/√<Hz>. The Hall probe is not magnetized by magnetic fields hence enabling the real time (〜1frame/sec) measurments in external magnetic fields. The results described include the observation of sharp magnetic transitions in written floppy disks to coalesce into small islands under external fields and the transformation of magnetic bubble lattices into striped-maze patterns in Bi-substituted iron garnet thin films in external bias fields. Results obtained using a Bi micro-Hall probe sensor are described.
社団法人電子情報通信学会の論文
2001-07-06