http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Giant magnetoimpedance effect in nanocrystalline Fe73.5-xMnxSi13.5B9Nb₃Cu₁(x=1, 3, 5) alloys
L.A. Tuan,N.D. Ha,C.O. Kim,N.D. Tho,H.B. Lee 한국자기학회 2005 한국자기학회 학술연구발표회 논문개요집 Vol.15 No.1
The giant magnetoimpedance (GMI) of Fe_(73.5-x)Mn_xSi_(13.5)B_9Nb₃Cu₁ (x= 1, 3, 5) alloys prepared by a rapid quenching technique has been measured to investigate the influence of the structural changes in the crystallization process as well as the changes of the soft magnetic properties such as permeability, coercivity, magnetic anisotropy, etc. after thermal treatment. Magnetoimpedance ratio (MIR) and incremental permeability ratio (PR) measurements were investigated in the frequency range of 1-10 ㎒ and at a fixed current of 10 ㎃. Ultrasoft magnetic behavior has been observed in the samples annealed at 560℃. The PR curves become narrower and sharper after heat treatment due to the decrease of anisotropy. The MIR and PR coincided with the softness of the magnetic properties of the thermally treated samples.
Anomalous magnetoimpedance in Co–Fe–Al–O thin films
Tuan, L. A.,Phan, M. H.,Ha, N. D.,Kim, C. G.,Kim, C. O.,Yu, S. C. Wiley - VCH Verlag GmbH & Co. KGaA 2007 Physica Status Solidi C Vol.4 No.12
<P>The high-frequency giant magnetoimpedance (GMI) effect in a Co<SUB>47.5</SUB>Fe<SUB>21.9</SUB>Al<SUB>17.2</SUB>O<SUB>15.2</SUB> thin film was systematically investigated. In the frequency range of 100–500 MHz, GMI profiles showed a double-peak characteristic, reflecting an evident existence of the transverse magnetic anisotropy in the film, which coincided with the magnetization data. Interestingly, there was an anomalous transformation in the GMI profile from “positive” to “negative” and this was associated with the complex phase transformation of permeability. The GMI ratio decreased with decreasing film-thickness, due to an increase of the electrical resistivity and a decrease of the magnetic softness. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Magnetic properties and magnetocaloric effect in Fe90-x Sn x Zr10 alloy ribbons
Phan, T. L.,Dan, N. H.,Thanh, T. D.,Mai, N. T.,Ho, T. A.,Yu, S. C.,Le, Anh-Tuan,Phan, M. H. Korean Physical Society 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.8
<P>This work points out the possibility of tuning the magnetocaloric (MC) effect in Fe90-x Sn (x) Zr-10 alloy ribbons in the temperature range from 235 to 315 K by changing the Sn-doping content (x). Under an applied field change from 0 to 50 kOe, the maximum magnetic-entropy changes around the ferromagnetic-paramagnetic phase transition are about 3.6, 4.1 and 3.3 J kg(-1)center dot K-1 for x = 0, 2 and 4, respectively, which correspond to relative cooling powers of 280 similar to 410 J center dot kg(-1). Studying the magnetic properties of the alloy ribbons based on Banerjee's criteria and assessing the magneticordering parameter n = dLn|Delta S (m) |/dLnH (where Delta S (m) and H are the magnetic-entropy change and the magnetic field, respectively) reveals that the alloys undergo a second-order phase transition and exhibit a short-range ferromagnetic order. The nature of these phenomena is further analyzed by means of the results obtained from the analyses of the crystal structure, the Curie-Weiss law, and the Griffith phase.</P>
Ultrasoft magnetic properties of Co–Fe–Hf–O nanocomposite films
Ha, N. D.,Phan, M. H.,Tuan, L. A.,Phan, T. L.,Kim, C. G.,Kim, C. O.,Yu, S. C. WILEY-VCH Verlag 2007 Physica status solidi. PSS. A, Applications and ma Vol.204 No.12
<P>This paper reports on the excellent high-frequency magnetic performance of Co–Fe–Hf–O thin films, which were deposited on Si(100) substrates by the oxygen reactive rf-sputtering method. It was shown that the films possessed not only high electrical resistivity but also large saturation magnetization and hard-axis anisotropy field. Among the compositions investigated, Co<SUB>19.35</SUB>Fe<SUB>53.28</SUB>Hf<SUB>7.92</SUB>O<SUB>19.35</SUB> exhibited the ultrasoft magnetic properties of high saturation magnetization, 4πM<SUB>s</SUB> ∼19.86 kG, and low coercivity, H<SUB>c</SUB> ∼1.5 Oe. The magnetic permeability remained almost constant up to 3 GHz and reached a maximum at the ferromagnetic resonant frequency of 4.024 GHz. These properties of this film together with a high electrical resistivity of 3569 μΩcm make it ideal for producing micromagnetic devices for high-frequency applications. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Tuning of the Curie Temperature in La1-xSrxMn1-yTiyO₃
N. X. Phuc,N. T. Hieu,N. T. H. Le,D. H. Manh,N. A. Tuan,L. V. Hong,L. T. C. Tuong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Magnetic nanoparticles of La₁-xSrxMn₁-yTiyO₃ were prepared by using a sol-gel method, followed by annealing at various elevated temperatures. We found that the Curie temperature of the manganite nanoparticles could easily be tuned (from TC ~ 90 ℃ down to ~20 ℃) by substitution of nonmagnetic Ti⁴+ ions (from y = 0 to 7 %) for Mn. A comparison showed that the titanium substitution approach had advantages such as the phase transition being sharper and the magnetization remaining higher than in the case of the earlier known way of TC reduction by decreasing the Sr content from the optimal value of x = 0.3. The new features seem to make La1..xSrxMn₁..yTiyO₃ nanoparticles promising for hyperthermia application. Magnetic nanoparticles of La₁-xSrxMn₁-yTiyO₃ were prepared by using a sol-gel method, followed by annealing at various elevated temperatures. We found that the Curie temperature of the manganite nanoparticles could easily be tuned (from TC ~ 90 ℃ down to ~20 ℃) by substitution of nonmagnetic Ti⁴+ ions (from y = 0 to 7 %) for Mn. A comparison showed that the titanium substitution approach had advantages such as the phase transition being sharper and the magnetization remaining higher than in the case of the earlier known way of TC reduction by decreasing the Sr content from the optimal value of x = 0.3. The new features seem to make La1..xSrxMn₁..yTiyO₃ nanoparticles promising for hyperthermia application.