Quantitative TEM imaging of the magnetostructural and phase transitions in FeRh thin film systems.
Quantitative TEM imaging of the magnetostructural and phase transitions in FeRh thin film systems.
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DOI：
10.1038/s41598-017-18194-0
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发表时间：
2017-12-19
影响因子：
4.6
通讯作者：
McVitie S
中科院分区：
文献类型：
--
作者：
Almeida TP;Temple R;Massey J;Fallon K;McGrouther D;Moore T;Marrows CH;McVitie S
等原子FeRh是一种非常有趣的材料，因为它在75-105 °C之间经历从反铁磁（AF）到铁磁（FM）相的磁结构转变。它的能力，目前的相共存分离的畴壁（DW）在室温以上提供了巨大的潜力，利用其DW运动的自旋电子器件。为了能够有效地控制与AF/FM共存FeRh薄膜中的DW，我们必须充分了解DWs在局部尺度上的磁结构转变和热磁行为。在这里，我们提出了一个透射电子显微镜调查的过渡在平面FeRh薄膜样品相结合的微分相衬（DPC）磁成像与原位加热。我们进行定量测量，从个别DWs作为温度的函数，表明NiAl上的FeRh表现出热磁行为符合从AF到FM的过渡。具有HF蚀刻衬底的FeRh样品的DPC成像揭示了AF/FM共存的状态，并显示从AF到FM区域的过渡通过小涡旋结构的成核进行，然后通过与新成核的涡旋状态结合而生长成更大的复杂磁畴，直到它处于完全FM状态。
Equi-atomic FeRh is a very interesting material as it undergoes a magnetostructural transition from an antiferromagnetic (AF) to a ferromagnetic (FM) phase between 75–105 °C. Its ability to present phase co-existence separated by domain walls (DWs) above room temperature provides immense potential for exploitation of their DW motion in spintronic devices. To be able to effectively control the DWs associated with AF/FM coexistence in FeRh thin films we must fully understand the magnetostructural transition and thermomagnetic behaviour of DWs at a localised scale. Here we present a transmission electron microscopy investigation of the transition in planar FeRh thin-film samples by combining differential phase contrast (DPC) magnetic imaging with in situ heating. We perform quantitative measurements from individual DWs as a function of temperature, showing that FeRh on NiAl exhibits thermomagnetic behaviour consistent with the transition from AF to FM. DPC imaging of an FeRh sample with HF-etched substrate reveals a state of AF/FM co-existence and shows the transition from AF to FM regions proceeds via nucleation of small vortex structures, which then grow by combining with newly nucleated vortex states into larger complex magnetic domains, until it is in a fully-FM state.
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影响因子：
41.2
作者：
Marti, X.;Fina, I.;Ramesh, R.
通讯作者：
Ramesh, R.
影响因子：
2.8
作者：
Duchamp, Martial;Xu, Qiang;Dunin-Borkowski, Rafal E.
通讯作者：
Dunin-Borkowski, Rafal E.
影响因子：
8.6
作者：
Cowburn, RP;Koltsov, DK;Tricker, DM
通讯作者：
Tricker, DM
影响因子：
4
作者：
Baldasseroni, C.;Bordel, C.;Hellman, F.
通讯作者：
Hellman, F.
影响因子：
6.1
作者：
Le Graet, C.;Charlton, T. R.;Marrows, C. H.
通讯作者：
Marrows, C. H.