Determination of magnetic anisotropy constants for magnetic garnet epitaxial films using ferromagnetic resonance

Jalali-Roudsar, Amir Abbas; Denysenkov, Vasyl; Khartsev, Sergiy

doi:10.1016/j.jmmm.2004.07.019

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…There are also a few methods that can give higher-order terms, such as the torque method 19 20 21 and the magnetic resonance method 22 23 . It is worth noting that the ferromagnetic resonance (FMR) method is one of the best methods for determining magnetic anisotropy with very high sensitivity 24 25 . There are two kinds of FMR experiments, frequency-swept FMR and magnetic field-swept FMR.…”

Section: Methodsmentioning

confidence: 99%

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Fan

Zhou

Rao

et al. 2015

Sci Rep

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Based on the electric rotating magnetoresistance method, the shape anisotropy of a Co microstrip has been systematically investigated. We find that the shape anisotropy is dependent not only on the shape itself, but also on the magnetization distribution controlled by an applied magnetic field. Together with micro-magnetic simulations, we present a visualized picture of how non-uniform magnetization affects the values and polarities of the anisotropy constants and . From the perspective of potential appliantions, our results are useful in designing and understanding the performance of micro- and nano-scale patterned ferromagnetic units and the related device properties.

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Section: Methodsmentioning

confidence: 99%

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Fan

Zhou

Rao

et al. 2015

Sci Rep

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“…We analyzed the data obtained through FMR measurements in the Magnetic-Anisotropy-Energy (MAE) model, which has been successfully applied to metallic ferromagnets [13], diluted magnetic semiconductors [28], and oxide thin films [16,29]. In this framework the resonance frequency, ω 0 , for uniform precession can be found through the total free magnetic energy of the system [30,31].…”

Section: Modelsmentioning

confidence: 99%

Thickness dependence of dynamic and static magnetic properties of pulsed laser deposited La0.7Sr0.3MnO3 films on SrTiO3(001)

Monsen

Boschker

Maciá

et al. 2014

Journal of Magnetism and Magnetic Materials

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We present a comprehensive study of the thickness dependence of static and magneto-dynamic magnetic properties of La 0.7 Sr 0.3 MnO 3 . Epitaxial pulsed laser deposited La 0.7 Sr 0.3 MnO 3 / SrTiO 3 (001) thin films in the range from 3 unit cells (uc) to 40 uc (1.2 -16 nm) have been investigated through ferromagnetic resonance spectroscopy (FMR) and SQUID magnetometry at variable temperature. Magnetodynamically, three different thickness, d, regimes are identified: 20 uc d uc where the system is bulk like, a transition region 8 uc ≤ d 20 uc where the FMR line width and position depend on thickness and d = 6 uc which displays significantly altered magnetodynamic properties, while still displaying bulk magnetization. Magnetization and FMR measurements are consistent with a nonmagnetic volume corresponding to ∼ 4 uc. We observe a reduction of Curie temperature (T C ) with decreasing thickness, which is coherent with a mean field model description. The reduced ordering temperature also accounts for the thickness dependence of the magnetic anisotropy constants and resonance fields. The damping of the system is strongly thickness dependent, and is for thin films dominated by thickness dependent anisotropies, yielding both a strong 2-magnon scattering close to T c and a low temperature broadening. For the bulk like samples a large part of the broadening can be linked to spread in magnetic anisotropies attributed to crystal imperfections/domain boundaries of the bulk like film.

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“…Magneto-optic (Paz, 2012), dipolar energy contributions (Bose, 2012), nanocrystalline (Maklakov, 2012;Raita, 2012), La0.7Sr0.3MnO3 films (Golosovsky, 2012), La0.67Ba0.33Mn1-yA y O3, A -Fe, Cr , voltage-controlled magnetic anisotropy (VCMA) and spin transfer torque (Zhu, 2012) and the typical properties of the inertial resonance are investigated (Olive, 2012). The exchange bias (Backes, 2012), Q cavities for magnetic material (Beguhn, 2012), MgO/CoFeB/Ta structure , the interfacial origin of the giant magnetoresistive effect (GMR) phenomenon (Prieto, 2012), selfdemagnetization field (Hinata, 2012), Fe3O4/InAs(100) hybrid spintronic structures (Huang, 2012), granular films (Kakazei, 1999(Kakazei, , 2001Sarmiento, 2007;Krone, 2011;Kobayashi, 2012), nano-sized powdered barium (BaFe12O19) and strontium (Sr Fe12O19) hexaferrites (Korolev, 2012), Ni0.7Mn0.3-x CoxFe2O4 ferrites (NiMnCo: x = 0.00, 0.04, 0.06, and 0.10) (Lee, 2012), thin films (Demokritov, 1996(Demokritov, ,1997Nakai, 2002;Lindner, 2004;Aswal, 2005;Jalali-Roudsar, 2005;Cochran, 2006;Mizukami, 2007;Seemann, 2010), Ni2MnGa films (Huang, 2004), magnetic/electronic order of films (Shames, 2012), Fe1-xGd(Tb)x films , in ε-Al0.06Fe1.94O3 (Yoshikiyo, 2012). 10 nm thick Fe/GaAs(110) film (Römer, 2012), triangular shaped permalloy rings (Ding, 2012) and Co2-Y hexagonal ferrite single rod (Bai, 2012) structures and properties have been studied by FMR tecniques (Spaldin, 2010).…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Resonance

Yaln¹

2013

Ferromagnetic Resonance - Theory and Applications

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The following information can be accessed with the help of such resonance experiments. (i) Electrical structure of point defects by looking at the absorption in a thin structure. (ii) The line width with the movement of spin or surroundings isn't changed. (iii) The distribution of the magnetic field in solid by looking at the of the resonance line position (chemical shift and etc.). (iv) Collective spin excitations. Ferromagnetic Resonance-Theory and Applications 2 The atoms of ferromagnetic coupling originate from the spins of d-electrons. The size of μ permanent atomic dipoles create spontaneously magnetized. According to the shape of dipoles materials can be ferromagnetic, antiferromagnetic, diamagnetic, paramagnetic and etc. Ferromagnetic resonance (FMR) technique was initially applied to ferromagnetic materials, all magnetic materials and unpaired electron systems. Basically, it is analogous to the electron paramagnetic resonance (EPR). The EPR technique gives better results at unpaired electron systems. The FMR technique depends on the geometry of the sample at hand. The demagnetization field is observed where the sample geometry is active. The resonance area of the sample depends on the properties of material. The FMR technique is advantageous because it does not cause damage to materials. Also, it allows a three dimensional analysis of samples. The FMR occurs at high field values while EPR occurs at low magnetic field values. Also, line-width of ferromagnetic materials is large according to paramagnetic materials. Exchange interaction energy between unpaired electron spins that contribute to the ferromagnetism causes the line narrowing. So, ferromagnetic resonance lines appear sharper than expected. The FMR studies have been increased since the EPR was discovered in

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Determination of magnetic anisotropy constants for magnetic garnet epitaxial films using ferromagnetic resonance

Cited by 9 publications

References 18 publications

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Thickness dependence of dynamic and static magnetic properties of pulsed laser deposited La0.7Sr0.3MnO3 films on SrTiO3(001)

Ferromagnetic Resonance

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