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José Miguel García-martín - One of the best experts on this subject based on the ideXlab platform.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots
Nanoscale Research Letters, 2016Co-Authors: Fanny Béron, Andreas Kaidatzis, Murilo F. Velo, Luis C. C. Arzuza, Ester M. Palmero, Rafael P. Del Real, Dimitrios Niarchos, Kleber R. Pirota, José Miguel García-martínAbstract:The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane Magnetization Component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular Magnetization Component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane Component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots.
Nanoscale research letters, 2016Co-Authors: Fanny Béron, Andreas Kaidatzis, Murilo F. Velo, Luis C. C. Arzuza, Ester M. Palmero, Dimitrios Niarchos, Kleber R. Pirota, Rafael P. Del Real, José Miguel García-martínAbstract:The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane Magnetization Component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular Magnetization Component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane Component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.
Fanny Béron - One of the best experts on this subject based on the ideXlab platform.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots
Nanoscale Research Letters, 2016Co-Authors: Fanny Béron, Andreas Kaidatzis, Murilo F. Velo, Luis C. C. Arzuza, Ester M. Palmero, Rafael P. Del Real, Dimitrios Niarchos, Kleber R. Pirota, José Miguel García-martínAbstract:The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane Magnetization Component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular Magnetization Component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane Component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots.
Nanoscale research letters, 2016Co-Authors: Fanny Béron, Andreas Kaidatzis, Murilo F. Velo, Luis C. C. Arzuza, Ester M. Palmero, Dimitrios Niarchos, Kleber R. Pirota, Rafael P. Del Real, José Miguel García-martínAbstract:The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane Magnetization Component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular Magnetization Component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane Component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.
Stuart Gilder - One of the best experts on this subject based on the ideXlab platform.
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Cenozoic magnetostratigraphy and magnetic properties of the southern Issyk-Kul basin, Kyrgyzstan
Tectonophysics, 2014Co-Authors: Michael Wack, Stuart Gilder, Julien Charreau, Euan Macaulay, Edward Sobel, Alexander MikolaichukAbstract:We present paleomagnetic data from the northern flank of the Tianshan range, southeast of Lake Issyk-Kul (Kyrgyzstan). 613 cores were collected in two parallel sections with a total thickness of 960 m (Chon Kyzylsuu, CK) and 990 m (Jeti Oguz, JO), as well as 48 cores at six sites in a nearby anticline. Rock magnetic analyses identify both magnetite and hematite in the fluvial–lacustrine sediments. The concentration of both minerals, the magnetite:hematite ratio, and the average magnetite grain size increase upward in both sections. Anisotropy of anhysteretic remanent Magnetization defines a tectonic fabric with sub-horizontal maximum axes that parallel the strike direction together with intermediate and minimum axes that streak out about a great circle orthogonal to the maximum axes suggestive of a tectonic fabric emplaced during folding. Stepwise thermal deMagnetization isolates interpretable Magnetization Components in 284 samples that define 26 polarity chrons in CK and 19 in JO. A positive fold test, dual polarities and systematic changes in rock-magnetic parameters with depth suggest that the high temperature Magnetization Component was acquired coevally with deposition. An age model based on a visual magnetostratigraphic correlation of both sections with the geomagnetic polarity time scale defines absolute ages from 26.0 to 13.3 Ma, with a fairly constant sedimentation rate of 9–10 cm/ka. A correlation based on a numerical algorithm arrives at a slightly different conclusion, with deposition ages from 25.2 to 11.0 Ma and sedimentation rates from 5 to 8 cm/ka. In comparison with sedimentation rates found at other magnetostratigraphic sections in the Tianshan realm, we infer that the sedimentary record in this part of the Issyk-Kul Basin precedes the more rapid phase of uplift of the Kyrgyz Tianshan. The onset of deposition and concomitant erosion of the adjacent Terskey Range is in good agreement with independent assessments of the exhumation history of this mountain range, with erosion increasing at 25–20 Ma and accelerating after 11–13 Ma.
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Neogene uplift of the Tian Shan Mountains observed in the magnetic record of the Jingou River section (northwest China)
Tectonics, 2009Co-Authors: Julien Charreau, Stuart Gilder, Yan Chen, Stephane Dominguez, Jean Philippe Avouac, Laurie Barrier, Romain Augier, Sevket Sen, Audrey Gallaud, Fabien GraveleauAbstract:The Tian Shan Mountains constitute central Asia's longest and highest mountain range. Understanding their Cenozoic uplift history thus bears on mountain building processes in general, and on how deformation has occurred under the influence of the India-Asia collision in particular. In order to help decipher the uplift history of the Tian Shan, we collected 970 samples for magnetostratigraphic analysis along a 4571-m-thick section at the Jingou River (Xinjiang Province, China). Stepwise alternating field and thermal deMagnetization isolate a linear Magnetization Component that is interpreted as primary. From this Component, a magnetostratigraphic column composed of 67 polarity chrons are correlated with the reference geomagnetic polarity timescale between ~1 Ma and ~23.6 Ma, with some uncertainty below ~21 Ma. This correlation places precise temporal control on the Neogene stratigraphy of the southern Junggar Basin and provides evidence for two significant stepwise increases in sediment accumulation rate at ~16–15 Ma and ~11–10 Ma. Rock magnetic parameters also undergo important changes at ~16–15 Ma and ~11–10 Ma that correlate with changes in sedimentary depositional environments. Together with previous work, we conclude that growth history of the modern Tian Shan Mountains includes two pulses of uplift and erosion at ~16–15 Ma and ~11–10 Ma. Middle to upper Tertiary rocks around the Tian Shan record very young (
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Evidence for coeval Late Triassic terrestrial impacts from the Rochechouart (France) meteorite crater
Geophysical Research Letters, 2006Co-Authors: Laurent Carporzen, Stuart GilderAbstract:[1] High temperature impact melt breccias from the Rochechouart (France) meteorite crater record a Magnetization Component with antipodal, normal and reverse polarities. The corresponding paleomagnetic pole for this Component lies between the 220 Ma and 210 Ma reference poles on the Eurasian apparent polar wander path, consistent with the 214 ± 8 Ma 40Ar/39Ar age of the crater. Late Triassic tectonic reconstructions of the Eurasian and North American plates place this pole within 95% confidence limits of the paleomagnetic pole from the Manicouagan (Canada) meteorite impact crater, which is dated at 214 ± 1 Ma. Together, these observations reinforce the hypothesis of a Late Triassic, multiple meteorite impact event on Earth.
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magnetostratigraphy and rock magnetism of the neogene kuitun he section northwest china implications for late cenozoic uplift of the tianshan mountains
Earth and Planetary Science Letters, 2005Co-Authors: Julien Charreau, Stuart Gilder, Yan Chen, Stephane Dominguez, Jean Philippe Avouac, Yongan Li, Weiming WangAbstract:In order to better constrain the tectonic evolution of central Asia under the influence of the India–Asia collision, we carried out a magnetostratigraphic study at the Kuitun He section, on the northern flank of the Tianshan range (northwest China). A total of 801 samples were collected from a 1559-m-thick section, which is composed mainly of fluvio-lacustrine sandstone and conglomerate. Stepwise thermal and alternating field deMagnetization isolated a linear Magnetization Component that decays univectorally toward the origin and likely represents a primary Magnetization principally carried by magnetite. From this Component, 29 magnetic polarity intervals were identified. They correlate between ~3.1 and ~10.5 Ma with the reference magnetic polarity time scale, indicating a relatively constant sedimentation rate with an average of 0.21±0.01 mm/year. We also performed a suite of rock magnetic experiments designed to track time-transgressive changes in the sedimentary record. From the rock magnetic parameters, together with the constant sedimentation rate, we conclude that the Tianshan mountains were actively uplifting by ~10.5 Ma.
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Magnetostratigraphy and Rock Magnetism of the Neogene Yaha Section (Northwest China) and Possible Late Cenozoic Uplift of the Tianshan by 11 Ma
2004Co-Authors: Julien Charreau, Stuart Gilder, Yan Chen, Stephane Dominguez, Jean Philippe Avouac, Sevket SenAbstract:In order to better constrain the timing of the Cenozoic uplift history of the Tianshan due to the India-Asia collision, we carried out a magnetostratigraphic study at the Yaha section, on the southern flank of the Tianshan range (northwest China). 1069 samples were collected from a 2814-m-thick section composed mainly of fluvio-lacustrine sandstone and conglomerate mapped as the Neogene Kuqa Formation. Rock magnetic experiments show that the magnetic remanence is principally carried by magnetite yet hematite is also abundant . Stepwise thermal deMagnetization isolated a linear Magnetization Component that decays univectorally toward the origin. Based on a positive fold test and the equal proportion of magnetic polarities, the isolated direction likely represents a primary Magnetization. Eighteen magnetic polarity changes were identified. They correlate between ~5.2 and ~12.6 Ma with the reference magnetic polarity time scale. We also measured the anisotropy of magnetic susceptibility of the samples. Before ~ 11 Ma the average shape parameter T of the AMS is around 0 meaning the grains are spherical in shape and far-traveled. By ~11 Ma, T strongly increases to values strictly greater than 0 meaning that the magnetic grains are oblate in shape and traveled less far. The timing of this change in the T parameter is strongly correlated to a decrease in the bulk susceptibility that likely signals a modification of the source rock. From the rock magnetic parameters, together with the acceleration of the sedimentation rate, we conclude that the uplift of the Tianshan mountains started by ~ 11 Ma.
Józef Korecki - One of the best experts on this subject based on the ideXlab platform.
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Tailoring of the perpendicular Magnetization Component in ferromagnetic films on a vicinal substrate.
Physical review letters, 2008Co-Authors: Andrzej Stupakiewicz, Andrzej Maziewski, K. Matlak, Nika Spiridis, Slezak M, T. Slezak, M. Zajac, Józef KoreckiAbstract:We have engineered the magnetic properties of 1-8 nm Co films epitaxially grown on an Au-buffered bifacial W(110)/W(540) single crystal. The surface of Au/W(110) was atomically flat, whereas the Au/W(540) followed the morphology of the vicinal W surface, showing a regular array of monoatomic steps. For Co grown on Au/W(540), the existence of the out-of-plane Magnetization Component extended strongly to a thickness d of about 8 nm, which was accompanied by an anomalous increase of the out-of-plane switching field with increasing d. In addition, the process of up-down Magnetization switching could be realized with both a perpendicular and in-plane external magnetic field.
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Magnetization processes in ultrathin Au∕Co∕Au films grown on a bifacial Mo(110)/Mo(540) single crystal
Journal of Applied Physics, 2008Co-Authors: Andrzej Stupakiewicz, Andrzej Maziewski, K. Matlak, M. Ślęzak, T. Ślęzak, M. Zając, Józef KoreckiAbstract:We studied Magnetization reversal processes and magnetic anisotropy in ultrathin Au∕Co∕Au films deposited on a bifacial Mo(110)/(540) single crystal. The influence of the Co thickness and miscut angle on the spin reorientation from out-of-plane into in-plane Magnetization were investigated by means of the magneto-optical Kerr effect (MOKE). In the case of Co grown on a vicinal Au∕Mo(540) substrate, the perpendicular Magnetization Component was found throughout the 1–8nm Co thickness range. The canted orientation of Magnetization was deduced from vectorial MOKE magnetometry. The out-of-plane switching field, which is 160Oe for the perpendicular Magnetization, increases to about 960Oe as observed at 8nm Co thickness on the vicinal part. The experimental data are discussed taking into account both uniaxial out-of-plane and in-plane magnetic anisotropy energy terms. The results indicate the possibility of tuning the perpendicular Magnetization Component with the use of vicinal substrates, and are important fr...
Luis C. C. Arzuza - One of the best experts on this subject based on the ideXlab platform.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots
Nanoscale Research Letters, 2016Co-Authors: Fanny Béron, Andreas Kaidatzis, Murilo F. Velo, Luis C. C. Arzuza, Ester M. Palmero, Rafael P. Del Real, Dimitrios Niarchos, Kleber R. Pirota, José Miguel García-martínAbstract:The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane Magnetization Component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular Magnetization Component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane Component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots.
Nanoscale research letters, 2016Co-Authors: Fanny Béron, Andreas Kaidatzis, Murilo F. Velo, Luis C. C. Arzuza, Ester M. Palmero, Dimitrios Niarchos, Kleber R. Pirota, Rafael P. Del Real, José Miguel García-martínAbstract:The effect of arrays of nanometer scale pores on the magnetic properties of thin films has been analyzed. Particularly, we investigated the influence of the out-of-plane Magnetization Component created by the nanopores on the in-plane magnetic behavior of patterned hard/soft magnetic thin films in antidot morphology. Its influence on the coupling in Co/Py bilayers of few tens of nanometer thick is compared for disordered and ordered antidots of 35-nm diameter. The combination of magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) technique allows probing the effects of the induced perpendicular Magnetization Component on the bilayer magnetic behavior, while magnetic force microscopy (MFM) is used to image it. We found that ordered antidots yield a stronger out-of-plane Component than disordered ones, influencing in a similar manner the hard layer global in-plane magnetic behavior if with a thin or without soft layer. However, its influence changes with a thicker soft layer, which may be an indication of a weaker coupling.