scholarly journals Many-body localization from random magnetic anisotropy

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Jie Gu ◽  
Shuanglong Liu ◽  
Maher Yazback ◽  
Hai-Ping Cheng ◽  
X.-G. Zhang
Keyword(s):  
Magnetic Anisotropy ◽  
Many Body ◽  
Random Magnetic Anisotropy

scholarly journals Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Anna Galler ◽  
Semih Ener ◽  
Fernando Maccari ◽  
Imants Dirba ◽  
Konstantin P. Skokov ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnetic Anisotropy ◽  
High Performance ◽  
Kondo Effect ◽  
Quantitative Description ◽  
Many Body ◽  
Heavy Rare Earth Elements ◽  
Fe Intermetallics ◽  
Full Temperature

AbstractCerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems are poorly understood due to the difficulty of a quantitative description of the Kondo effect, a many-body phenomenon where conduction electrons screen out the Ce-4f moment. Here, we show that the Ce-4f shell in Ce–Fe intermetallics is partially Kondo screened. The Kondo scale is dramatically enhanced by nitrogen interstitials suppressing the Ce-4f contribution to the magnetic anisotropy, in striking contrast to the effect of nitrogenation in isostructural intermetallics containing other rare-earth elements. We determine the full temperature dependence of the Ce-4f single-ion anisotropy and show that even unscreened Ce-4f moments contribute little to the room-temperature intrinsic magnetic hardness. Our study thus establishes fundamental constraints on the potential of cerium-based permanent magnet intermetallics.

Effects of Heat Treatment Conditions on Magnetic Properties and Structural Features of Nanocrystalline Fe79Zr10N11 Films

2009 ◽  
Vol 152-153 ◽  
pp. 70-74 ◽  
Author(s):  
E.N. Sheftel ◽  
Rauf S. Iskhakov ◽  
S.V. Komogortsev ◽  
P.K. Sidorenko ◽  
Nikolai S. Perov
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Structural Features ◽  
Soft Magnetic ◽  
Exchange Correlation ◽  
Calculation Technique ◽  
Treatment Conditions ◽  
Random Magnetic Anisotropy ◽  
Anisotropy Model

Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocrystalline Fe79Zr10N11 films were obtained using a calculation technique in frame of the random magnetic anisotropy model. The calculations are performed using approach magnetization to saturation curves. The local magnetic anisotropy fields (Ha), and magnetic anisotropy correlation radii (Rс) reduced to =(A/K)1/2 were determined for the films annealed at 475 and 6000 C for 0.5, 1, 2, and 3 h. The correlation Hc ~(Rc/)3 for the all annealed films was found.

Microstructure and random magnetic anisotropy in Fe–Ni based nanocrystalline thin films

2008 ◽  
Vol 41 (15) ◽  
pp. 155009 ◽  
Author(s):  
Senoy Thomas ◽  
S H Al-Harthi ◽  
D Sakthikumar ◽  
I A Al-Omari ◽  
R V Ramanujan ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Random Magnetic Anisotropy ◽  
Nanocrystalline Thin Films

Random magnetic anisotropy studies in nanocrystalline Pr2Co7Hx (0 ≤ x ≤ 3.75) hydrides

2018 ◽  
Vol 449 ◽  
pp. 461-466 ◽  
Author(s):  
Z. Yamkane ◽  
R. Fersi ◽  
F.Z. Rachid ◽  
R. Moubah ◽  
H. Lassri ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Random Magnetic Anisotropy

Magnetization Correlations and Random Magnetic Anisotropy in Nanocrystalline Films Fe78Zr10N12

2012 ◽  
Vol 190 ◽  
pp. 486-489 ◽  
Author(s):  
S.V. Komogortsev ◽  
Rauf S. Iskhakov ◽  
E.N. Sheftel ◽  
E.V. Harin ◽  
A.I. Krikunov ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Magnetic Anisotropy ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Nanocrystalline Films ◽  
Force Microscopy ◽  
Random Magnetic Anisotropy ◽  
Good Agreement

The quantitative analysis of static ferromagnetic correlations in nanocrystalline films Fe78Zr10N12was performed by two methods: the correlation magnetometry technique and magnetic force microscopy. The data, obtained by both methods, prove to be in good agreement.

Random Magnetic Anisotropy and Ferromagnetic Resonance in Nanosrystalline Alloy Fe73.5CuNb3Si13.5B9

2010 ◽  
Vol 168-169 ◽  
pp. 365-368 ◽  
Author(s):  
S.V. Komogortsev ◽  
Rauf S. Iskhakov ◽  
P. Kuznetsov ◽  
A. Belyaeva ◽  
G. Bondarenko ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Resonance ◽  
Annealing Temperature ◽  
Anisotropy Field ◽  
Correlation Radius ◽  
Magnetization Curves ◽  
Annealing Conditions ◽  
Random Anisotropy ◽  
Random Magnetic Anisotropy ◽  
Annealing Temperature Dependence

In the paper, we will present experimental results on the Fe73.5CuNb3Si13.5B9 ferromagnetic resonance (FMR) line width as a function of annealing conditions, as well as the annealing-temperature dependence of the crystallite size, coercive force, and the magnetic anisotropy field. We shall show the interrelationship of these quantities, demonstrate that these parameters are all traceable to the nanoparticle crystallization, and indicate how they can be examined by extending the random anisotropy theory. To obtain quantitative parameters of random magnetic anisotropy we investigate the magnetization curves approaching saturation. This technique allows one to quantitatively determine the local magnetic anisotropy field (Ha) and magnetic anisotropy correlation radius (Rc), as well as to estimate the averaged magnetic anisotropy field (<Ha>L) and ferromagnetic correlation radius (RL).

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