کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153565 | 1524767 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Beating the macroscopic quantum tunneling limit by man-made magnetic dead layers
ترجمه فارسی عنوان
ضرب و شتم تونل های کوانتومی ماکروسکوپیک توسط لایه های مغناطیسی ساخته شده توسط انسان ساخته شده است
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کلمات کلیدی
تونل زنی کوانتومی مغناطیسی، لایه های مغناطیسی مرده، اکسید آهن، خیس خوردن،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
Magnetic dead layers (MDLs) are always undesirable in practical applications due to their highly frustrated spin configurations and severe degradation of host magnetism. Here we provide new insights in MDLs and unravel their attractive prospect for ferrimagnetic hybrid of Fe3O4 and γ-Fe2O3 (denoted as Fe3O4@γ-Fe2O3 in the main text) to exhibit macroscopic quantum tunneling (MQT) phenomena in measureable kelvin range. The 3â¯nm-sized negatively-charged Fe3O4@γ-Fe2O3 nanoparticles were immersed in various metal chloride solutions containing Mn2+, Co2+, Ni2+, Fe3+, and Fe2+ cations to form cationic MDLs via electrostatic attraction. These man-made MDLs, if being of positive enough zeta potentials, greatly disordered the magnetic dipole interactions among Fe3O4@γ-Fe2O3 nanoparticles and induce extra energy barrier to yield pronounced MQT effect in Fe3O4@γ-Fe2O3 nanoparticles even though they were dispersed neither in water nor in oil. Their crossover temperatures dividing MQT and purely thermal relaxation were found to be one order of magnitude higher than reported values in other MQT systems, and more strikingly, they could be tailored by altering the soak period in our facile and scalable route.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 454, 15 May 2018, Pages 221-227
Journal: Journal of Magnetism and Magnetic Materials - Volume 454, 15 May 2018, Pages 221-227
نویسندگان
Ji Ma, Kezheng Chen,