氨气氮化制备六方氮化铁钴的晶体结构和磁性能

IF 1.1 4区物理与天体物理 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Magnetics Letters Pub Date : 2023-03-27 DOI:10.1109/LMAG.2023.3262452

Chihiro Kodaka;Mikio Kishimoto;Eiji Kita;Hideto Yanagihara

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引用次数: 0

摘要

采用氨气硝化法合成了$x$=2.25–2.48的单相$\varepsilon$-（FeCo）xN化合物颗粒。在9T磁场下10K下的质量磁化强度$M$为77A$\cdot$M$^｛2｝$/kg，居里温度$T$C为100K，$x$=2.48。这些数值随着氮含量的增加而降低。与$\varepsilon$-FexN相比，（FeCo）xN的$M$和$T$C值显著较低，即使在氮含量相当的情况下也是如此。Mössbauer谱表明，Co的磁矩随着氮含量的增加而减小，并且在大约$x$=2.35时消失，即使在最低测量温度$T$=3K时也是如此。在磁化率的温度依赖性中观察到Griffiths类相磁行为。实验结果表明，当氮含量较低时，在$x$=2.25时，Fe–Fe相互作用可能从铁磁变为反铁磁。

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Crystal Structure and Magnetic Properties of Hexagonal FeCo Nitrides Prepared Using Ammonia Gas Nitrification

Single-phase

$\varepsilon$

-(FeCo)_xN compound particles with

$x$

= 2.25–2.48 were synthesized using ammonia gas nitrification. The mass magnetization

$M$

at 10 K under a magnetic field of 9 T was 77 A

$\cdot$

$^{2}$

/kg, and Curie temperature

$T$

_C was 100 K for

$x$

= 2.48. These values decreased with increasing nitrogen content. Compared with

$\varepsilon$

-Fe_xN, (FeCo)_xN had significantly lower

$M$

and

$T$

_C values, even at comparable nitrogen content. Mössbauer spectroscopy suggests that the magnetic moment of Co decreases with increasing nitrogen content and disappears at approximately

$x$

= 2.35, even at the lowest measurement temperature of

$T$

= 3 K. Griffiths phaselike magnetic behavior was observed in the temperature dependence of magnetic susceptibility. The experimental results indicate that the Fe–Fe interaction may change from ferromagnetic to antiferromagnetic at

$x$

= 2.25 when the nitrogen content is low.

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来源期刊

IEEE Magnetics Letters PHYSICS, APPLIED-

CiteScore

2.40

自引率

0.00%

发文量

期刊介绍： IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics. IEEE Magnetics Letters publishes short, scholarly articles of substantial current interest. IEEE Magnetics Letters is a hybrid Open Access (OA) journal. For a fee, authors have the option making their articles freely available to all, including non-subscribers. OA articles are identified as Open Access.