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The magnetic properties and microstructure of FePt film on island-like Ge3Pt2 were studied in this paper. The surface morphology of GePt underlayer on different deposition temperature were discussed and the island-like GePt-FePt underlayer was explored. The structural analysis were done by TEM, grazing incident XRD, and FESEM with EDS attachment. Magnetic hysteresis were measured at room temperature...
Room-temperature (RT) sample scanning superconducting quantum interference device (SQUID) microscopy (SSM) is a very powerful and promising technique for imaging magnetic field distributions . A SQUID microscope with interchangeable sensor configurations for imaging magnetic fields of room-temperature (RT) samples with sub-millimeter resolution was developed. The sensors are mounted in the vacuum...
Nano-magnetic materials and the shrinking bit size of magnetic recording media demand improvement in magnetic imaging techniques and in local magnetic metrology. In this paper, we describe the new ferromagnet-coated carbon nanotube tips and also the improvements in the process and the resulting process yield; present experimental evidence for the ultimate limits on the sensitivity and resolution related...
This paper presents the first quantitative evaluation of the pinned uncompensated spin (UCS) density on the scale of single grains obtained from high lateral resolution magnetic force microscopy. All measurements presented were performed on one ferromagnetic-antiferromagnetic (FM/AFM) multilayer sample that contained a Co/Pt multilayer as ferromagnetic layer and CoO as an AFM layer. TEM of the CoO...
The soft under layer (SUL) is used to improve write head filed strength, field gradient and read-back signal in perpendicular magnetic media. In this study, four type SUL structures were fabricated. Samples were post-annealed and cooled to room temperature under magnetic field along radial direction. VSM, MFM and Guzik spin stand were used to analyze the magnetic properties, domain structure and noise...
In this study, the spatial distribution of MSF in CoCrPt-Si02 granular perpendicular recording medium and CoCrPt patterned medium are reported. MFM images were observed with a SPA300HV scanning probe microscope coupled to an electromagnet producing a controllable perpendicular magnetic field of up to 10 kOe in a vacuum. The diameter of the cutting edge of the probe tip was less than 30 nm. Measurement...
In the present study we show two variations of the bottom-up approach. First our correlated structural and magnetic properties studies on epitaxial FePd films grown on (001) MgO will show that this particular system does exhibit perpendicular magnetic anisotropy and it is also nano-structured due to 3-dimensional growth mode on the chosen substrate. We also note here that the highly-ordered nanostructures...
This paper compares the images obtained by superparamagnetic and permanent magnetic force microscopy (MFM) tips, that allows us to explain the issues related to the frequency double in some of domain images of the recording media. This paper also investigates the domain structures of high density recording bits (up to 1100 kfci) written on ac and dc-erased CoPtCrO perpendicular magnetic recording...
A high-frequency MFM (HF-MFM) is built up for the observation of the high-frequency stray fields of harddisk write heads, using a commercial AFM/MFM system as a basis. In this contribution, the amplitude-modulation technique were employed, where an amplitude-modulated current was applied to the head coil in order to detect the force gradient induced by the HF magnetic field. The piezo element is still...
This study reports on the investigation of magnetic parameters of nanoislands Fe/MgO(001) films. Ferromagnetic resonance (FMR) analysis, atomic force microscopy (AFM), magneto-optical Kerr effect (MOKE) and magnetic force microscopy (MFM) techniques are used to characterize these nanoisland films.
In this paper, magnetic properties of dumbbell shaped magnetic elements is discussed. Magnetic force microscopy (MFM) is used to map the magnetic spin distribution inside the elements and their arrangements under application of a varying applied field. Object Oriented Micro-magnetic Framework (OOMMF) simulations are used to understand and explain their switching behavior. These nanostructures can...
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