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15 May 2003

Volume 93, Issue 10, pp. 5855-8792

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Magnetic force microscopy evaluation of written track distortions induced by media stray fields

Shaoping Li, Wenzhong Zhu, Lei Wang, and Dean Palmer

J. Appl. Phys. 93, 8531 (2003); http://dx.doi.org/10.1063/1.1543871 (3 pages) | Cited 2 times

Online Publication Date: 9 May 2003

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The precise examination of the written track distortions induced by stray fields from media can help in understanding the magnetic recording process in many ways so as to optimize recording components/subsystem performance. In this work, the edge distortion, amplitude asymmetry, and transition shift of written tracks, which are induced by the media magnetostatic field, are characterized using the magnetic force microscope via a special analysis procedure. The written track distortions on different media erasure backgrounds and track edge environments were evaluated with the measurement accuracy as low as ±2 nm. © 2003 American Institute of Physics.
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85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)
68.37.Rt Magnetic force microscopy (MFM)

Magnetic force microscopy study on amorphous TbFe thin films

Zhi-gang Sun, Tao Zhu, Zhen-rong Zhang, Bao-gen Shen, Bao-shan Han, Jhy-Chau Shih, and Tsung-Shune Chin

J. Appl. Phys. 93, 8534 (2003); http://dx.doi.org/10.1063/1.1540127 (3 pages) | Cited 1 time

Online Publication Date: 9 May 2003

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By using magnetic force microscope (MFM), honeycomb domain structures were found in the as-deposited amorphous TbFe thin films with perpendicular magnetic anisotropy. The domain structures were composed of many small white round dots embedded in the black matrix, which formed an irregular hexagonal pattern with some deformation. MFM measurements were performed with various scanning heights and opposite tip magnetization directions. The z component of both the magnetization and the stray field of the dots were determined quantitatively within the point probe approximation. Charge contrast and susceptibility contrast were separated by forming the difference and sum of two images with opposite tip magnetization. © 2003 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.30.Gw Magnetic anisotropy
75.30.Cr Saturation moments and magnetic susceptibilities
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.50.Bb Fe and its alloys

In situ applied field imaging of a magnetic tunnel junction using magnetic force microscopy

J. Leib, C. C. H. Lo, J. E. Snyder, and D. C. Jiles

J. Appl. Phys. 93, 8537 (2003); http://dx.doi.org/10.1063/1.1540128 (3 pages) | Cited 1 time

Online Publication Date: 9 May 2003

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Knowledge of domain behavior in magnetic tunnel junctions is an essential component, together with knowledge of the electron band structure, for understanding their magnetoelectronic properties. To this purpose, the magnetization reversal processes of a multilayer tunnel junction of structure substrate/NiFe/AlOx/FeCo/CrPtMn/Al of tapered half-ellipsoid shape have been imaged using a magnetic force microscope (MFM) with in situ applied magnetic fields. Stripe domains through both the stack and free layers observed at zero applied field were erased by a ∼100 Oe field applied to the left followed by applying a small field to the right. Magnetic domain structure did not reappear in the MFM images until a field of ∼400 Oe was applied to the right. This domain pattern then persisted when the magnetic field was reduced to zero. A drastic difference in domain patterns throughout the rotational processes to saturation in each direction was also observed. When the field was applied to the left, domain walls rotated toward the direction perpendicular to the applied field before disappearing. However, in near-saturation fields to the right, domain walls formed nearly parallel to the applied field and rotated away from parallel as the applied field strength was decreased. From these images, therefore, significant insight has been gained into the magnetization processes and physical phenomena behind the magnetoresistive behavior of these junctions. © 2003 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Kw Domain structure (including magnetic bubbles and vortices)
85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
75.47.De Giant magnetoresistance
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Construction of hysteresis loops of single domain elements and coupled permalloy ring arrays by magnetic force microscopy

Xiaobin Zhu, P. Grütter, V. Metlushko, Y. Hao, F. J. Castaño, C. A. Ross, B. Ilic, and H. I. Smith

J. Appl. Phys. 93, 8540 (2003); http://dx.doi.org/10.1063/1.1540129 (3 pages) | Cited 23 times

Online Publication Date: 9 May 2003

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Magnetic structure and magnetization reversal of permalloy ring arrays and elongated permalloy particle array were studied by magnetic force microscopy (MFM). For single domain permalloy particles, the hysteresis loop is constructed by counting the percentage of switched elements imaged at remanence. For permalloy ring elements, two different states are energetically stable: a vortex state and an onion state. Their hysteresis loop is obtained by MFM imaging at a field between the switching fields of these two states. The magnetostatic coupling among these ring elements is directly revealed. © 2003 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.60.Jk Magnetization reversal mechanisms
07.79.Pk Magnetic force microscopes
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Bb Fe and its alloys
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