共查询到19条相似文献，搜索用时 57 毫秒
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在制备出Gd3(Fe1-xCox)29-yCry化合物基础上,成功制备出Sm3(Fe1-xCox)29-yCry化合物,通过x射线衍射和热磁分析对R3(Fe1-xCox)29-yCry(R＝Gd,Sm)化合物相稳定性进行了研究,利用原子半径的几何因素解释了高Co含量3:29型化合物必须要有较多稳定元素的原因.对于不同的稳定元素,稳定元素半径越大,所需稳定元素含量越少,可是稳定元素的半径愈大,其增大晶格常数的能力愈强,这反而不利于稳定3:29相.通过对R3(Fe1-xCox)29-yCry(R=Gd,Sm)化合物相稳定性的研究,成功地制备出具有室温单轴磁晶各向异性的Gd3(Fe1-xCox)29-yCry(0.4≤x≤1.0;4.0≤y≤6.5)及新的Sm3(Fe1-xCox)29-yCry(0.4≤x≤1.0;4.5≤y≤7.5)化合物. 相似文献
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用铁磁共振方法得到了双层铁磁薄膜的色散关系解析表达式.发现共振场依赖于层间耦合强度和应力场.假定层间为反铁磁性耦合,且铁磁层Ａ有较强的平面内各向异性.随着外磁场的增强,铁磁层Ｂ中的磁化强度突然由最初的反平行转为平行,从而导致色散曲线的阶跃,并且发现光学模阶跃幅度比声学模大.随着应力场的增强,Ｂ层中磁化强度反转所需的外磁场减弱.此外,在不同的交换耦合强度和应力场下,光学模共振场对外磁场方向的依赖性较强.关键词：双层铁磁薄膜界面相互作用应力各向异性场铁磁共振 相似文献
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具有条纹磁畴结构的磁性薄膜表现出面内转动磁各向异性,对于解决高频电子器件的方向性问题起着至关重要的作用.本文采用射频磁控溅射的方法,研究了NiFe薄膜的厚度、溅射功率密度、溅射气压等制备工艺参数对条纹磁畴结构、面内静态磁各向异性、面内转动磁各向异性、垂直磁各向异性的影响规律.研究发现,在功率密度15.6 W/cm~2与溅射气压2 mTorr(1 Torr=1.33322×102Pa)下生长的NiFe薄膜,表现出条纹磁畴的临界厚度在250 nm到300 nm之间.厚度为300 nm的薄膜比250 nm薄膜的垂直磁各向异性场增大近一倍,从而磁矩偏离膜面形成条纹磁畴结构,并表现出面内转动磁各向异性.高溅射功率密度可以降低薄膜出现条纹磁畴的临界厚度.在相同功率密度15.6 W/cm~2下生长300 nm的NiFe薄膜,随着溅射气压由2 mTorr增大到9 mTorr,NiFe薄膜的垂直磁各向异性场逐渐由1247.8 Oe(1 Oe=79.5775 A/m)增大到3248.0 Oe,面内转动磁各向异性场由72.5 Oe增大到141.9 Oe,条纹磁畴周期从0.53μm单调减小到0.24μm.NiFe薄膜的断面结构表明柱状晶的形成是表现出条纹磁畴结构的本质原因,高功率密度下低溅射气压有利于柱状晶结构的形成,表现出规整的条纹磁畴结构,高溅射气压会导致柱状晶纤细化,面内转动磁各向异性与面外垂直磁各向异性增强,条纹磁畴结构变得混乱. 相似文献
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采用铁磁共振方法,研究了铁磁/反铁磁双层薄膜中交换各向异性和应力各向异性对其物理性质的影响.结果表明,单向各向异性来源于界面交换作用,应力各向异性对材料的磁化难易程度有较大影响.当外磁场方向与应力场方向平行时,应力场的存在将促进该方向的磁化.反之,应力场将会阻碍该方向的磁化. 相似文献
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运用Landau-Devonshire热力学唯像理论,考虑铁电相和铁磁相的电致伸缩、磁致伸缩效应以及产生于铁电/铁磁和薄膜/基底界面的弹性应力作用,两次重整介电和磁作用系数得到了这种多铁系统在Landau自由能函数下的本征二次方磁电耦合形式,从而研究了外延1-3型纳米多铁复合薄膜中极化、磁化随薄膜厚度、温度的变化以及该薄膜中外加电场诱导的磁化变化.结果表明薄膜平面内的应压力的弛豫使得磁化强度和极化强度随薄膜厚度的增加而减少,外加电场不仅能诱导铁电相极化场翻转,而且由于铁电和铁磁相界面竖直方向的弹性耦合导致关键词：多铁磁电效应磁致伸缩薄膜 相似文献
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M. Belmeguenai H. Tuzcuoglu S. M. Chrif K. Westerholt T. Chauveau F. Mazaleyrat P. Moch 《physica status solidi (a)》2013,210(3):553-558
Cu2MnAl films of different thicknesses (50, 70, and 100 nm) were grown by UHV RF‐sputtering on a‐plane sapphire or on MgO (100) substrates. Their structural and static magnetic properties have been studied by X‐rays diffraction (XRD) and by vibrating sample magnetometry (VSM), respectively. The Cu2MnAl films exhibit a (100) and (110)‐texture when grown on MgO and sapphire substrates, respectively. The best growth quality and the higher magnetization at saturation were obtained for the films grown on MgO. Dynamic magnetic properties were investigated using micro‐strip line ferromagnetic resonance (MS‐FMR). From the resonance measurements varying the direction and the amplitude of the in‐plane and out‐of‐plane applied magnetic fields we derive the effective magnetization, the Landé g‐factor (g = 2.11), the exchange constant (Aex = 0.34 µerg cm−1) and the magnetic anisotropy terms. The in‐plane anisotropy can be described as a superposition of two terms showing a small twofold and a dominant fourfold symmetry. 相似文献
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《中国物理 B》2021,30(9):97501-097501
Among the layered two-dimensional ferromagnetic materials(2 D FMs),due to a relatively high T_C,the van der Waals(vdW) Fe_3 GeTe_2(FGT) crystal is of great importance for investigating its distinct magnetic properties.Here,we have carried out static and dynamic magnetization measurements of the FGT crystal with a Curie temperature TC ≈ 204 K.The M-H hysteresis loops with in-plane and out-of-plane orientations show that FGT has a strong perpendicular magnetic anisotropy with the easy axis along its c-axis.Moreover,we have calculated the uniaxial magnetic anisotropy constant(K_1)from the SQUID measurements.The dynamic magnetic properties of FGT have been probed by utilizing the high sensitivity electron-spin-resonance(ESR) spectrometer at cryogenic temperatures.Based on an approximation of single magnetic domain mode,the K_1 and the effective damping constant(α_(eff)) have also been determined from the out-of-plane angular dependence of ferromagnetic resonance(FMR) spectra obtained at the temperature range of 185 K to T_C.We have found large magnetic damping with the effective damping constant α_(eff) ～ 0.58 along with a broad linewidth(ΔH_(pp) 1000 Oe at 9.48 GHz,H ‖ c-axis).Our results provide useful dynamics information for the development of FGT-based spintronic devices. 相似文献
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We present a simulation of the magnetization curves, energy, probability, and torque landscapes of uniaxial systems with up to five anisotropy constants. The total energy used in the simulation is the sum of the anisotropy and Zeeman energies. The exchange interaction is not considered in the present work in which we treat single-domain-particle systems within a classical mechanics-based model. Diverse features of the calculated magnetization curves are highlighted for the studied systems. These diverse features are strongly dependent on the sign and magnitude of the simulation parameters.The model is versatile enough to handle both hypothetical and real material systems, e.g. HoFe_(11)Ti and Y_2Co_(17). 相似文献
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M. Belmeguenai F. Zighem D. Faurie H. Tuzcuoglu S.‐M. Chrif P. Moch K. Westerholt W. Seiler 《physica status solidi (a)》2012,209(7):1328-1333
Co2MnSi (CMS) films of different thicknesses (20, 50, and 100 nm) were grown by radio frequency (RF) sputtering on a‐plane sapphire substrates. Our X‐rays diffraction (XRD) study shows that, in all the samples, the cubic 〈110〉 CMS axis is normal to the substrate and that six well defined preferential in‐plane orientations are present. Static and dynamic magnetic properties were investigated using vibrating sample magnetometry (VSM) and microstrip line ferromagnetic resonance (MS‐FMR), respectively. From the resonance measurements versus the direction and the amplitude of an applied magnetic field, most of the magnetic parameters are derived, i.e.: the magnetization, the gyromagnetic factor, the exchange stiffness coefficient, and the magnetic anisotropy terms. The in‐plane anisotropy results from the superposition of two terms showing a twofold and a fourfold symmetry, respectively. The observed behavior of the hysteresis loops is in agreement with this complex form of the in‐plane anisotropy. 相似文献
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Cristina Bran Ester M. Palmero Rafael P. del Real Manuel Vazquez 《physica status solidi (a)》2014,211(5):1076-1082
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Enhancement of ferromagnetic resonance in Al203-doped CozFeAI Heusler alloy film prepared by oblique sputtering 
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下载免费PDF全文 Large and variable in-plane uniaxial magnetic anisotropy in a nanocrystalline （Co2FeA1）97.8（Al2O3）2.2 soft magnetic thin film is obtained by an oblique sputtering method without being induced by magnetic field or post anneaiing. The in-plane uniaxiai magnetic anisotropy varies from 50 Oe to 180 Oe （1 Oe=79.5775 A·m-1） by adjusting the sample＇s position. As a result, the ferromagnetic resonance frequency of the film increases from 1.9 GHz to 3.75 GHz. 相似文献
