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Register a new userStudy of Anisotropy and periodicity in certain magnetization distributions by Magnetic force microscopy
دراسة اللا تناحي و الدورية في توزعات للمغنطة بمجهرية القوة المغنطيسية
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Damascus University ورقة بحثية
Publication date
2013
fields
Physics
and research's language is
العربية
Authors
سهام الطرابيشي( باحث )
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إن مجهرية القوة المغنطيسية شكل من أشكال مجهرية القوة الذرية، حيث تقوم نهاية مدببة ممغنطة بمسح عينة ممغنطة؛ يكشف فيها عن التفاعلات المغنطيسية بين النهاية المدببة و العينة التي تستخدم في إعادة بناء البنية المغنطيسية لسطح العينة. و قد كان نمط تشغيل المجهر المعتمد في هذا العمل هو نمط اللاتماس الدينميكي الذي نحصل من خلاله على صور لكل من طبوغرافية سطح العينة و تغيرات سعة اهتزاز النهاية المدببة و تغيرات طور اهتزاز النهاية المدببة. بالاستعانة بمؤثر الترابط الذاتي أمكن دراسة اللاتناحي و الدورية في توزعات مغنطيسية لأجيال مختلفة من الأقراص المرنة.
Magnetic force microscopy (MFM) is a variety of atomic force microscopy, where a sharp magnetized tip scans a magnetic sample; the tip-sample magnetic interactions are detected and used to reconstruct the magnetic structure of the sample surface. In this work, we have used Dynamic (AC) noncontact AFM (NC-AFM) mode. A mode which provide micrographs for topography, oscillation amplitude changes and phase shift. Using the autocorrelation Operator, we studied the anisotropy and periodicity in magnetization distributions in different generations of floppy disks.
References used
D. A. Bonnell, Scanning Probe Microscopy and Spectroscopy (2000). "7" (2 ed.). Wiley-VCH
D. Jiles. (1998). "15". Introduction to Magnetism and Magnetic Materials (2 ed.). Springer
L. Abelmann, S. Porthun, et al. (1998). "Comparing the resolution of magnetic force microscopes using the CAMST reference samples". J. Magn. Magn. Mater. 190: 135–147
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Palaeomagnetism and some magnetic and physical properties (magnetic
susceptibility, intensity of remanent magnetization, ac current electrical
conductivity and density) of 115 samples from 18 sites of the Yemen Volcanic
Group TKY (Tertiary and (or
) Cretaceous) from igneous rock exposures from
Sana’a region were studied. One palaeomagnetic pole position was determined
and a magneto-strigraphy of the area was suggested. The different properties
were measured in order to use them as characteristic factors in discriminating
the neighboring igneous flows. The measurement of the in situ magnetic
susceptibility of 80 points, distributed on 4 sub-areas, in the area helped to
calculate the mean value of the magnetic susceptibility of each sub-area, which
may be used in any magnetic interpretation of aeromagnetic or magnetic
anomalies. Also, the density of 115 samples were measured and a mean value of
the density of each sub-area and an overall mean density of each rock age, were
calculated in order to be used in any future interpretation of any gravity
anomaly in the area.
Palaeomagnetism and some magnetic and physical properties (magnetic
susceptibility, intensity of the Natural Remnant Magnetization (NRM), ac
current electrical conductivity and density) of 136 samples from 22 sites of the
Yemen Volcanic Group TKY
(Tertiary and (or) Cretaceous) from igneous rock
exposures along the road from Sana’a – west towards Al-Hudyadah were
studied. A single population consists of seven Virtual Geomagnetic Poles
(VGP), of the Upper Oligocene, was accepted and a mean at 182.81° E, 77.44° N
with α95= 12.5° was calculated. The different properties were measured in
order to use these properties as characteristic factors to discriminate the
neighboring igneous flows. The measurement of the in situ magnetic
susceptibility of 140 points, distributed on 7 sub-areas, in the region helped to
calculate the mean value of the magnetic susceptibility of each sub-area, which
might be used in any magnetic interpretation of aeromagnetic or magnetic
anomalies. Also, the density of 132 samples were measured and a mean value of
the density of each sub-area was calculated in order to be used in any future
interpretation of any gravity anomaly in the area.
Density
Basalt
الكثافة
المتأثرية المغنطيسية
المغنطيسية المتبقية الأولية
مجموعة صخور اليمن الاندفاعية
Magnetic susceptibility
Palaeomagnetism
بازلت
الناقلية الكهربائية (بالتيار المتناوب)
اغنمبريت
طف ملتحم
بورفيريت أساسي
أغلوميريت
NRM = Natural Remnant Magnetization
ac current electrical conductivity
(Virtual Geomagnetic Poles (VGPs
ignembrite
welded tuffs
basic porphyrites
المزيد..
Palaeomagnetism and some magnetic and physical properties such as
magnetic susceptibility, intensity of remanent magnetisation, ac current
electrical conductivity and density for the number order (٣٩ - ٥٤) of samples
from ٩ sites of Upper Pliocene
basaltic rocks from the area west of
Homs were studied. The aim of the works to extend the previous studies (Abou-
Deeb, ١٩٩٧a, b) to other regions so that these properties might be used as
characteristic factors in discriminating the basaltic flows.
Palaeomagnetism and some magnetic and physical properties (magnetic
susceptibility, intensity of remanent magnetisation, ac current electrical
conductivity and density) of many basaltic samples were studied.
Syria
سورية
Density
حُمّص
الكثافة
المتأثرية المغنطيسية
المغنطيسية المتبقية الأولية
Magnetic susceptibility
Magnetostratigraphy
Homs
ac current electrical conductivity
الناقلية الكهربائية بالتيار المتناوب
الستراتغرافيا المغنطيسية
زمن القطبية
كسوة
سويداء
NRM= Natural Remanent Magnetisation
polarity chron
Kisweh
Swedah
المزيد..
Some magnetic and physical properties ( magnetic susceptibility , intensity
of remanent magnetisation , ac current electrical conductivity and density ) of
١٨١ samples from ٣٠ sites of Middle Miocene basaltic rocks (β 1
N2) from Al-
Kisweh region
south of Damascus were studied, in order to extend the previous
study ( Abou-Deeb, ١٩٩٧) to other regions so that these properties might be
used as characteristic factors in discriminating the neighbouring basaltic flows
.The measurement of the in situ magnetic susceptibility of ٧٥ basaltic sites ,
distributed on ٨ localities , in the region helped to calculate the mean value of
the magnetic susceptibility of each locality and an overall mean value of the
whole region, which might be used in any magnetic interpretation of the
magnetic anomalies. Also, the density of ١٢٨ samples were measured and a
mean value of the density of each locality and an overall mean density were
calculated in order to be used in any future interpretation of any gravity
anomaly in the region .
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