共查询到20条相似文献,搜索用时 46 毫秒
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在铁磁层(FM)/反铁磁层(FeMn)耦合体系中插入Pt 插层或对靠近FM/FeMn界面处的FeMn掺杂Pt元素,研究了体系的交换偏置场 Hex及矫顽力Hc随Pt插层深度 dPt与Pt掺杂层厚度tPtFeMn的变化关系. 实验结果表明,引入Pt插层后NiFe/FeMn(dPt)/Pt/FeMn体系的未补偿磁矩(UCS)的数量得到很大的提高,从而对Hex与Hc 起到增强的作用; 同时, 从实验结果可以推测FeMn层内部UCS的分布深度约为1.3 nm. 另外,对靠近FM/FeMn界面处的FeMn掺杂Pt元素,发现掺入Pt元素后体系的Hex 得到有效增强, 这是因为掺入Pt元素后体系UCS的数量也得到很大的提高. 相似文献
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第是 金属磁性多层膜的结构及其对巨磁电阻效应的影响 总被引:3,自引:0,他引:3
介绍了金属磁性多层膜的微结构和磁结构的研究进展,简要综述了磁性多层膜的结构与巨磁电阻(GMR)之间的关系。 相似文献
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研究铁磁/反铁磁/铁磁三层膜中界面存在二次以及双二次交换耦合下反铁磁磁矩转动及其交换各向异性.结果表明,其反铁磁膜中的磁矩转动存在可逆\"恢复行为\"、不可逆\"连续倒转行为\"以及不可逆\"中断倒转行为\"三种情形,三种情形的出现强烈地依赖于两界面处的线性耦合和双二次耦合.钉扎界面的交换耦合与旋转界面的交换耦合相互竞争,当钉扎界面耦合占主导时,反铁磁磁矩发生可逆\"恢复行为\",系统出现交换偏置.在旋转界面耦合占主导情形下,其线性耦合与双二次耦合也相互竞争,分别导致反铁磁磁矩发生不可逆\"连续倒转行为\"和不可逆\"中断倒转行为\",系统都不出现交换偏置,但矫顽场都得以增强.相关结论为实验上观测的磁滞能耗以及界面垂直耦合提供了可能的解释. 相似文献
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评述了磁性多层膜中磁层、界面和非磁层的结构及磁性的穆斯堡尔谱研究的新进展,并展望了今后的研究方向.A new progress in Mssbauer study on the magnetic structure and magnetic properites of the magnetic layer, interface layer and nonmagnetic layer in the magnetic multilayers is reviewed.Further research trend is also discussed. 相似文献
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R. M. Movsessyan A. S. Sahakyan M. A. Chalabyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2007,42(6):268-270
The scattering of nonspin-polarized electrons on a heterostructure containing a magnetic element (a nonmagnetic barrier adjoining a magnetic one from left or right, or a magnetic well between two nonmagnetic barriers) is considered. The transmission coefficients and degrees of the spin polarization of electrons transmitted through these structures are obtained. 相似文献
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The reflection coefficient of bulk spin waves from a ferromagnetic multilayer with periodically modulated parameters of the
exchange interaction, the uniaxial magnetic anisotropy and the saturation magnetization (a magnonic crystal) is calculated.
The dependence of the reflection coefficient upon the spin wave frequency and the values of the bias magnetic field, the parameter
of interfacial coupling, and the internal structure of the unit cell are investigated.
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The eigenproblems of spin waves in a symmetricalferromagnetic bilayered system with periodic boundary conditions aresolved using the interface-rescaling approach (IRA). The resultsshow that interface coupling between two sublayers would notchange the excitation energy of odd bulk modes, but changeexcitation energy of even bulk modes. We call this peculiarphenomenon the phenomenon of even bulk mode variance (PEBMV).There are two kinds of mechanisms which cause PEBMV:phase reversal and phase translation of the magnon at theinterface, corresponding, respectively, to the antiferromagnetic andferromagnetic interface coupling cases. PEBMV embodies the selectiveeffect of the interface on different bulk magnons. 相似文献
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应用s-d交换作用模型,在对自旋格林函数s-d交换相互作用单环近似下,求出了含铁磁纳米颗粒的颗粒膜中自旋激发弛豫.并以(a-C:H)1-xCox颗粒膜 为例,探讨了自旋激发弛豫随温度的变化规律.结果表明:经自旋极化激发实现的自旋激化弛豫过程与温度无关,而经热激活的自旋激发弛豫过程与温度有关.关键词:自旋激发弛豫颗粒膜铁磁颗粒 相似文献
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Investigation of ultra—thin ferromagnetic films with a simple cubic lattice 总被引:1,自引:0,他引:1
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Using Green‘s function method,we investigate ferromagnetic films with a simple cubic lattice containing up to ten monolayers.The Hamiltonian includes the Heisenberg exchange term,surface anisotropy (SA) and dipole interaction (DI).We calculate the magnetization as a function of temperature and film thickness,and we analyse the behaviour of spin canting.The result is in agreement with experiments.We calculate phase diagrams of SA versus DI to show the conditions under which spontaneous magnetization can occur.As a special case,we discuss the Heisenberg model without SA and DI. 相似文献
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NM/FI/NI/FI/NM新型双自旋过滤隧道结的隧穿电导和隧穿磁电阻 总被引:1,自引:0,他引:1
在NM/FI/FI/NM型双自旋过滤隧道结(此处NM为非磁金属层,FI为铁磁绝缘体或半导体层)的基础上,我们提出一种NM/FI/NI/FI/NM新型双自旋过滤隧道结(此处NI表示非磁绝缘体或半导体层). 插入NI层的目的是为了避免原双自旋过滤隧道结中相邻FI层界面处磁的耦合作用所导致的对隧穿磁电阻的不利影响. 在自由电子近似的基础上,利用转移矩阵方法,对NM/FI/NI/FI/NM新型双自旋过滤隧道结的隧穿电导、隧穿磁电阻与FI层及NI层厚度的变化关系以及随偏压的变化关系进行了理论研究.计算结果表明,在NM/FI/NI/FI/NM新型双自旋过滤隧道结中仍可以得到很大的TMR值.关键词:双自旋过滤隧道结隧穿磁电阻非磁绝缘(半导)体间隔层 相似文献
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By comparing the signals of electron spin resonance (ESR) from two crystals of a diamond (spin–labels) the demagnetizing field of the Co, Fe, and Ni samples in the shape of strongly elongated ellipsoids of revolution (disks) has been measured. The magnetic permeabilities of the metals in the external magnetic field corresponding to the ESR of the broken chemical bonds in a natural diamond irradiated with fast reactor neutrons have been determined. 相似文献
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Ting Lei;Wei Zhang;Guohao Bo;Chengyu Feng;Na Li;Rongzhi Zhao;Lianze Ji;Jian Zhang;Xuefeng Zhang; 《固体物理学:研究快报》2024,18(9):2400081
The importance of flexible ferromagnetic films in the application of flexible spintronic devices and microwave magnetic devices underscores the necessity for an in-depth understanding of the dynamic magnetic properties of these films. In particular, it is crucial to comprehend the regulation of the ferromagnetic resonance (FMR) frequency of flexible ferromagnetic films. This work outlines the preparation of periodic permalloy microstrip arrays with stripe domain on flexible PET films and applies them to linearly tune the FMR. The high-frequency optical branch (5.17 GHz) and low-frequency acoustic branch (2.89 GHz) are observed in the direction perpendicular (x-direction) and parallel (y-direction) to the microstrip, respectively. The Young's modulus mismatch between the PET film and permalloy layer leads to the directional distribution of local tension. This results in the enhancement of the Ht (219.4 Oe) required for the in-plane uniform precession on the PET film, compared to that on the Si substrate (181.6 Oe). By adjusting the width and thickness of the permalloy microstrip, Ht can be adjusted linearly on the PET film. This flexible ferromagnetic film with linear regulation of FMR frequency presents a new option for the future development of flexible microwave detectors and filters. 相似文献