title: Electron holography of magnetic field generated by a magnetic recording head.
abstract: The magnetic field generated by a magnetic recording head is evaluated using electron holography. A magnetic recording head, which is connected to an electric current source, is set on the specimen holder of a transmission electron microscope. Reconstructed phase images of the region around the magnetic pole show the change in the magnetic field distribution corresponding to the electric current applied to the coil of the head. A simulation of the magnetic field, which is conducted using the finite element method, reveals good agreement with the experimental observations.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Goto
authors.forename: Jong Seok
authors.initials: JS
authors.lastname: Jeong
authors.forename: Weixing
authors.initials: W
authors.lastname: Xia
authors.forename: Zentaro
authors.initials: Z
authors.lastname: Akase
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shindo
authors.forename: Kei
authors.initials: K
authors.lastname: Hirata
mesh_terms: D006696:Holography / Q000379:methods*; D060526:Magnetic Fields; D008280:Magnetics; D046529:Microscopy, Electron, Transmission / Q000295:instrumentation*; D013048:Specimen Handling
keywords: electron holography; finite element method; in situ observation; magnetic field; magnetic recording head; transmission electron microscopy