scholarly journals Robustness in Coupling between Iron and Rare Earth Spins in Rare Earth Orthoferrites

2020 ◽  
Vol 985 ◽  
pp. 29-34
Author(s):  
Mohanad Hazim Mohammed ◽  
Joseph Horvat ◽  
Zhen Xiang Cheng ◽  
Shi Xun Cao
Keyword(s):  
Rare Earth ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Metastable State ◽  
Spin System ◽  
Magnetic Moment ◽  
Magnetic Measurements ◽  
Spin Systems ◽  
Iron Ions ◽  
Magnetic Anisotropy Energy

We report on very accurate magnetic measurements on large rare earth orthoferrites single crystals of ErFeO3 and NdFeO3. Our results show that the interaction between rare earth and iron spin system does not change during the spin-flip process. This implies that the coupling between the iron and rare earth spin systems is robust enough to withstand the effects of spin flipping against the magnetic anisotropy energy. This is despite rare eath ions, polarized by the ordered iron ions, being in partly metastable state and their magnetic moment decays with time.

scholarly journals Room Temperature Magnetic Memory Effect in Cluster-Glassy Fe-Doped NiO Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1318 ◽  
Author(s):  
Ashish Chhaganlal Gandhi ◽  
Tai-Yue Li ◽  
B. Vijaya Kumar ◽  
P. Muralidhar Reddy ◽  
Jen-Chih Peng ◽  
...  
Keyword(s):  
Magnetic Moment ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Oxide System ◽  
Precipitation Method ◽  
Magnetic Memory ◽  
Nio Nanoparticles ◽  
Magnetic Anisotropy Energy ◽  
Spintronic Devices ◽  
Co Precipitation

The Fe-doped NiO nanoparticles that were synthesized using a co-precipitation method are characterized by enhanced room-temperature ferromagnetic property evident from magnetic measurements. Neutron powder diffraction experiments suggested an increment of the magnetic moment of 3d ions in the nanoparticles as a function of Fe-concentration. The temperature, time, and field-dependent magnetization measurements show that the effect of Fe-doping in NiO has enhanced the intraparticle interactions due to formed defect clusters. The intraparticle interactions are proposed to bring additional magnetic anisotropy energy barriers that affect the overall magnetic moment relaxation process and emerging as room temperature magnetic memory. The outcome of this study is attractive for the future development of the room temperature ferromagnetic oxide system to facilitate the integration of spintronic devices and understanding of their fundamental physics.

Structural, Magnetic and Electric Transport Properties for Co2FeAl0.5Si0.5/n-GaAs Junctions

2015 ◽  
Vol 233-234 ◽  
pp. 411-414
Author(s):  
Nobuki Tezuka ◽  
Tatsuya Saito ◽  
Masashi Matsuura ◽  
Satoshi Sugimoto
Keyword(s):  
Magnetic Anisotropy ◽  
Transport Properties ◽  
Magnetic Moment ◽  
Electrical Transport ◽  
Anisotropy Field ◽  
Electric Transport ◽  
Electrical Transport Properties ◽  
Magnetic Anisotropy Energy ◽  
Cross Sectional ◽  
Non Local

The authors have been investigated structural, magnetic and electrical transport properties for CFAS/n-GaAs junctions. From cross sectional TEM image, RHEED and XRD patternz of thin CFAS films, CFAS films found to be grown epitaxially on GaAs, and shown L21-ordered structure for the films with substrate temperature (TCFAS) of 300°C and 400°C. It is hard to find some additional phase around the interface between CFAS and GaAs. Magnetic moment (and magnetic anisotropy energy) of CFAS increased (and decreased) with increasingTCFASup to 300°C and decreased (and increased) atTCFASof 400°C, respectively. The asymmetry of current (J)-voltage (V) curve for the junction withTCFAS=300°C was found to be larger than those for other junctions. It was found there is the relation betweenTCFASdependence of spin signal obtained by three terminal Hanle or four terminal non-local measurement and that of magnetic moment, magnetic anisotropy field or asymmetry ofJ-Vcurve.

Oxygen Effect on Magnetic Anisotropy Energy of Co Nanowires on Cu(210) Surface - An Ab Initio Study

2015 ◽  
Vol 233-234 ◽  
pp. 530-533
Author(s):  
Julia Korobova ◽  
Dmitry Bazhanov ◽  
Irina Kamynina
Keyword(s):  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Magnetic Moment ◽  
Oxygen Effect ◽  
Easy Magnetization ◽  
Magnetic Anisotropy Energy ◽  
Magnetization Axis ◽  
Pure Cu ◽  
Co Nanowires ◽  
Pure Surface

An ab initio study of Co monatomic nanowires (NW) magnetic properties on pure and oxygen reconstructed Cu (210) surface was performed. Strong influence of oxygen surface impurity on MAE in Co nanowire was found. High value of magnetic moment and small energy of magnetic anisotropy (MAE) were obtained in Co nanowires on pure Cu (210) surface. After oxygen reconstruction of Cu (210) surface (Cu (210)-(2×1)O) the significant enhancement of MAE was found in Co nanowires, while the magnetic moment of Co atoms is practically unchanged. Oxygen on Cu (210) surface rotates easy magnetization axis in Co NW with respect to the pure surface.

Observation of a Large Magnetic Anisotropy in the New 2H-Perovskite Related Oxide Ba8CoRh6O21:  Magnetic Measurements on Aligned Single Crystals

2001 ◽  
Vol 40 (20) ◽  
pp. 5152-5156 ◽  
Author(s):  
H.-C. zurLoye ◽  
K. E. Stitzer ◽  
M. D. Smith ◽  
A. El Abed ◽  
J. Darriet
Keyword(s):  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Magnetic Measurements
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