Magnetic Moment Evolution in FeGaGeB(Si) Alloys that Dominate the Saturation Magnetization

2022 ◽  
Author(s):  
Qianke Zhu ◽  
Lu Guo ◽  
Zhe Chen ◽  
Qiushu Li ◽  
Wen Yang ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Magnetic Moment

Ferromagnetism in lightly Gd doped GaN: The role of defects

2011 ◽  
Vol 1290 ◽  
Author(s):  
J. K. Mishra ◽  
S. Dhar ◽  
M. A. Khaderabad ◽  
O. Brandt
Keyword(s):  
Magnetic Properties ◽  
Molecular Beam Epitaxy ◽  
Saturation Magnetization ◽  
Magnetic Moment ◽  
Molecular Beam ◽  
Defect Density ◽  
Defect Cluster ◽  
Clear Correlation ◽  
Defect Band

ABSTRACTGd:GaN layers grown with different Gd concentrations by molecular beam epitaxy (MBE) are studied using photoconductivity and photo-thermoelectric power spectroscopy. Our study reveals that the incorporation of Gd produces a large concentration of acceptor-like defects in the GaN lattice. The defect band is found to be located ~450meV above the valence band. Moreover, the concentration of defects is found to increase with the Gd concentration. The effect of annealing on the structural and the magnetic properties of GaN implanted with Gd is also investigated. A clear correlation between the saturation magnetization and the defect density is observed in implanted samples. The colossal magnetic moment per Gd ion and the ferromagnetism observed in this material is explained in terms of the formation of giant defect cluster around each Gd ion.

Magnetization Evolution with the Doping Element in Double Perovskite

2012 ◽  
Vol 490-495 ◽  
pp. 3140-3144
Author(s):  
Qin Zhang ◽  
Qing Wang ◽  
Suo Jia Yuan
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Saturation Magnetization ◽  
Magnetic Moment ◽  
Solid State Reaction ◽  
Single Phase ◽  
Magnetic Moments ◽  
Double Perovskite ◽  
Structure Investigation ◽  
Doping Element

Double perovskite (Sr1.85Ln0.15)FeMoO6 (Ln=Sr, La, Ce, Pr, Nd, Sm and Eu) have been prepared by solid-state reaction. Crystal structure investigation shows that all the samples are of single phase and belong to the I4/m space group. Saturation magnetization of the compounds at 5 K cannot be explained simply by ferrimagnetic model (FIM). However, the saturation magnetization at 100 K of the doped compounds exhibits a linear decrease with the increase of the anti-site defect concentration. Comparison of the saturation magnetization of the compounds at 5 K and 100 K suggests that at 5 K the magnetic moments of Ce, Pr, Nd and Sm align parallel with that of Fe, while the magnetic moment of Eu is anti-parallel with that of Fe.

scholarly journals Magnetic and Structural Properties of Iron Nitride thin Films Obtained by Argon-Nitrogen Reactive Radio-Frequency Sputtering

1995 ◽  
Vol 384 ◽  
Author(s):  
H. Chatbi ◽  
J.F. Bobo ◽  
M. Vergnat ◽  
L. Hennet ◽  
J. Ghanbaja ◽  
...  
Keyword(s):  
Thin Films ◽  
Corrosion Resistance ◽  
Saturation Magnetization ◽  
Structural Properties ◽  
Magnetic Moment ◽  
Iron Nitride ◽  
Good Corrosion Resistance ◽  
Radio Frequency Sputtering ◽  
Nitrogen Contents ◽  
Low Nitrogen

Fe-N thin films have attracted considerable attention because they are potential candidates for magnetic recording with their large saturation magnetization and their good corrosion resistance1. It has even been demonstrated that saturation magnetization can be larger than the bulk iron one for low nitrogen contents2. The origin of the enhanced magnetic moment could occur from the metastable α″ Fe16N2 phase or from an expanded bcc FeN structure which is also called α FeN.

The Enhanced Saturation Magnetization of Nanocrystalline (Ni0.5Zn0.5)1-xCoxFe2O4 Ferrite

2011 ◽  
Vol 415-417 ◽  
pp. 1372-1375
Author(s):  
Yi Bing Qiu ◽  
Yin Liu ◽  
Fan Fei Min ◽  
Yan Cao ◽  
Tai Qiu ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Magnetic Moment ◽  
Spinel Phase ◽  
Precipitation Method ◽  
Maximum Value ◽  
Nanocrystalline Ferrite ◽  
Co Precipitation

Single spinel phase nanocrystalline ferrite (Ni0.5Zn0.5)1-XCoxFe2O4was prepared using the spraying co-precipitation method. The coercivity of prepared (Ni0.5Zn0.5)1-XCoxFe2O4 increases with an increasing content of cobalt. The enhancement of the saturation magnetization was observed up to the maximum value of 102.1emu/g as x was 0.5. This can be attributed to the substitution of the Ni2+ and Zn2+ ions with Co2+ ions. This changed the net magnetic moment between the sublattices of structure.

scholarly journals Магнитная анизотропия многослойных гетероструктур [(Co-=SUB=-41-=/SUB=-Fe-=SUB=-39-=/SUB=-B-=SUB=-20-=/SUB=-)-=SUB=-x-=/SUB=-(SiO-=SUB=-2-=/SUB=-)-=SUB=-100-x-=/SUB=-/Bi-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=-]-=SUB=-47-=/SUB=-

2019 ◽  
Vol 61 (2) ◽  
pp. 266
Author(s):  
А.И. Безверхний ◽  
А.Д. Таланцев ◽  
Ю.Е. Калинин ◽  
А.В. Ситников ◽  
В.A. Никитенко ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Ferromagnetic Resonance ◽  
Magnetic Moment ◽  
Average Diameter ◽  
Anisotropy Constant ◽  
The Relationship

AbstractMagnetic anisotropy values are obtained for [(Co_41Fe_39B_20)_ x (SiO_2)_100 – _ x /Bi_2Te_3]_47 heterostructures consisting of SiO_2 alternating layers, CoFeB nanoparticles distributed in them, and Bi_2Te_3 layers with ferromagnetic resonance and magnetometry. The heterostructures have anisotropy of ~10^6 erg/cm^3, which orients the magnetic moment in films plane. The films are not solid, but they disintegrate into CoFeB nanoparticles with an average diameter of 5 nm during deposition, which corresponds to the blocking magnetization temperature of ~30 K during their saturation magnetization of M _ S = 720 emu/cm^3. The relationship between anisotropy constant and thickness of the layers of the heterostructures is nonmonotonic due to competition between surface and bulk anisotropies of the ferromagnetic granules, which the films are made of.

Investigation of Elemental Magnetic Moments of CoCrPt Films Using X-Ray Magnetic Circular Dichroism

2006 ◽  
Vol 111 ◽  
pp. 191-0
Author(s):  
C.J. Sun ◽  
Gan Moog Chow ◽  
G.H. Fecher ◽  
H.J. Lin ◽  
Y. Hwu ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Saturation Magnetization ◽  
Magnetic Moment ◽  
Sum Rules ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Total Magnetic Moment ◽  
Spin Moment ◽  
X Ray ◽  
Circular Dichroïsm

The elemental magnetic moments of Co and Cr in CoCrPt films were investigated using xray magnetic circular dichroism (XMCD). The spin and orbital moments of Co was calculated using the sum rules; it was found that the magnetic moment of Co in CoCrPt films was dominated by spin moment contribution. The total magnetic moment of Co was found to be lower than that of bulk Co. Further, the Cr moment was aligned anti-ferromagnetically with respect to Co, resulting in a decrease of saturation magnetization (Ms) in CoCrPt films.

ROLE OF DEFECTS IN SHAPING THE MAGNETIC PROPERTIES OF Gd-DOPED GaN

2011 ◽  
Vol 10 (04n05) ◽  
pp. 555-558 ◽  
Author(s):  
J. K. MISHRA ◽  
S. DHAR ◽  
M. A. KHADERABAD
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Magnetic Moment ◽  
Defect Density ◽  
Wavelength Dependence ◽  
Defect Cluster ◽  
Clear Correlation

The effect of annealing on the structural and the magnetic properties of GaN implanted with Gd is investigated. The wavelength dependence of the photoconductivity of Gd:GaN layers doped in situ is also studied. These results show that Gd incorporation produces defects not only in implanted samples, but also in Gd:GaN layers doped in situ. A clear correlation between the saturation magnetization and the defect density is observed in implanted samples. A model has been proposed to explain the effects of colossal magnetic moment per Gd ion and associated ferromagnetism observed in this system in terms of the formation of giant defect cluster around each Gd ion.

Exchange Effect in TM-TbCo/RE-TbCo Double Layer Films

2008 ◽  
Vol 47-50 ◽  
pp. 781-784
Author(s):  
G.P. Lin ◽  
Po Cheng Kuo ◽  
Y.H. Fang ◽  
Sin Liang Ou ◽  
S.C. Chen
Keyword(s):  
High Resolution ◽  
Domain Wall ◽  
Saturation Magnetization ◽  
Flux Density ◽  
Double Layer ◽  
Magnetic Moment ◽  
Room Temperature ◽  
High Saturation Magnetization ◽  
Exchange Effect ◽  
The Media

The High saturation magnetization (Ms) media are desired to yield large flux density for high resolution giant magnetoresistive head readout in Heat Assisted Magnetic Recording (HAMR). To ensure adequate stability of small size domains, the media for HAMR should possess large coercivity (Hc). In this work, we study of interface wall energy and the behavior of the magnetization of each layer in exchange coupled doubled-layered (ECDL) films. The Tb17Co83 (90 nm)/Tb30Co70 ECDL films with different Tb30Co70 thickness (20, 35, 50, 70, 90 nm) are made to increase the Ms value. As the thickness of Tb30Co70 film increase from 20 to 90 nm, the coercivity of the films increases from 2.5 to 8 kOe. The enhanced coercivity of ECDL films is due to the formation of domain wall at the interface of the ECDL film. As the Tb30Co70 increases from 20 to 90 nm, the Ms value of the films decreases from 380 to 330 emu/cm3. Due to Co has larger magnetic moment than that of Tb at room temperature, the resulting Ms value of the films decreases with increasing the thickness of Tb30Co70 layer.

scholarly journals Calibration of a Measuring Device to Determine Specific Saturation Magnetization by A Special Coil

2014 ◽  
Vol 65 (4) ◽  
pp. 262-264
Author(s):  
Michal Ulvr
Keyword(s):  
Saturation Magnetization ◽  
Standard Method ◽  
Magnetic Moment ◽  
Calibration Method ◽  
Ferromagnetic Materials ◽  
Expanded Uncertainty ◽  
Measuring Device ◽  
Sources Of Uncertainty ◽  
Specific Saturation Magnetization ◽  
Alternative Method

Abstract Specific saturation magnetization σS is an important parameter of ferromagnetic materials. It is in principle independent of the structure and shape of the sample. There are two ways to calibrate devices for determining σS: the standard method, using a calibrated magnetic moment standard, or an alternative method, using a special moment coil. This paper presents a calibration method used at Czech Metrology Institute for calibration of Koerzimat 1.096 using a special moment coil. Special attention is given to a description of the special moment coils used for Koerzimat 1.096 calibration, and to analysis of sources of uncertainty. Calibration expanded uncertainty of 0.4 up to 0.6 % can be achieved using this method.

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