Magnetoresistance of ferromagnetic Cr x Ti 1-x N solid solution nitride
Magnetoresistance of ferromagnetic Cr x Ti 1-x N solid solution nitride
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DOI：
10.1103/physrevb.78.052406
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发表时间：
2008-08
影响因子：
3.7
通讯作者：
K. Inumaru;Y. Miyaki;Kazuma Tanaka;Kunihiko Koyama;S. Yamanaka
中科院分区：
文献类型：
--
作者：
K. Inumaru;Y. Miyaki;Kazuma Tanaka;Kunihiko Koyama;S. Yamanaka
${\text{Cr}}_{x}{\text{Ti}}_{1\ensuremath{-}x}\text{N}$通过Cr-Ti合金氮化制备固溶体氮化物，以测量其磁性和输运性能。该实验的动机是对磁性的计算，指出了 CrN 和 ${\text{LaMnO}}_{3}$（巨大磁阻氧化物的母体化合物）的相似性。块体${\text{Cr}}_{0.5}{\text{Ti}}_{0.5}\text{N}$表现出很强的铁磁性$({T}_{c}\ensuremath{\sim}130\text{ }\text{K})$，而${\text{Cr}}_{0.67}{\text{Ti}}_{0.33}\text{N}$的铁磁性非常弱，与我们之前的外延薄膜样品的实验结果一致[Inumaru et al., Appl.物理。莱特。 91, 152501 (2007)]。这些结果证实，铁磁性是合金块体的固有特性，不能归因于薄膜外延生长引起的晶格应变。 ${\text{Cr}}_{0.5}{\text{Ti}}_{0.5}\text{N}$在5 T时表现出约5%的磁阻。磁阻可以通过缩放函数很好地表达$\ensuremath{-}(\ensuremath{\rho}\ensuremath{-}{\ensuremath{\rho}}_{0})/{\ensuremath{\rho}}_{0}=C{(M/{M}_{s})}^{2}$，其中$M$和${M}_{s}$分别是给定磁场的磁化强度和饱和磁化强度。氮化物的常数 $C$ 为 0.14，远小于锰氧化物的常数 $(C\ensuremath{\sim}4)$。
${\text{Cr}}_{x}{\text{Ti}}_{1\ensuremath{-}x}\text{N}$ solid solution nitrides were prepared by nitridation of Cr-Ti alloys to measure their magnetic and transport properties. The experiment was motivated by calculations on magnetism pointing out similarities of CrN and ${\text{LaMnO}}_{3}$ (the parent compound of colossal magnetoresistance oxides). The bulk ${\text{Cr}}_{0.5}{\text{Ti}}_{0.5}\text{N}$ showed strong ferromagnetism $({T}_{c}\ensuremath{\sim}130\text{ }\text{K})$ while ferromagnetism was very weak for ${\text{Cr}}_{0.67}{\text{Ti}}_{0.33}\text{N}$, being consistent with our previous experimental results for epitaxial thin-film samples [Inumaru et al., Appl. Phys. Lett. 91, 152501 (2007)]. These results confirmed that the ferromagnetism is an intrinsic characteristic of the bulk alloy and cannot be ascribed to lattice strains due to the epitaxy of the films. ${\text{Cr}}_{0.5}{\text{Ti}}_{0.5}\text{N}$ showed magnetoresistance of approximately 5% at 5 T. The magnetoresistance was expressed well by a scaling function $\ensuremath{-}(\ensuremath{\rho}\ensuremath{-}{\ensuremath{\rho}}_{0})/{\ensuremath{\rho}}_{0}=C{(M/{M}_{s})}^{2}$, where $M$ and ${M}_{s}$ are the magnetization for a given magnetic field and saturated magnetization, respectively. The constant $C$ for the nitride was 0.14, which was much smaller than that for manganese oxides $(C\ensuremath{\sim}4)$.