Large room‐temperature magneto‐optical Kerr effect in CuCr2Se4

1990 ◽  
Vol 56 (26) ◽  
pp. 2602-2603 ◽  
Author(s):  
H. Brändle ◽  
J. Schoenes ◽  
P. Wachter ◽  
F. Hulliger ◽  
W. Reim
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Optical Kerr Effect ◽  
Magneto Optical Kerr Effect

Large room-temperature magneto-optical Kerr effect in CuCr2Se4−xBrx (x = 0 and 0.3)

1991 ◽  
Vol 93 ◽  
pp. 207-210 ◽  
Author(s):  
H. Brändle ◽  
J. Schoenes ◽  
P. Wachter ◽  
F. Hulliger ◽  
W. Reim
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Optical Kerr Effect ◽  
Magneto Optical Kerr Effect

scholarly journals Room-temperature ultrafast carrier and spin dynamics in GaAs probed by the photoinduced magneto-optical Kerr effect

2001 ◽  
Vol 63 (23) ◽  
Author(s):  
A. V. Kimel ◽  
F. Bentivegna ◽  
V. N. Gridnev ◽  
V. V. Pavlov ◽  
R. V. Pisarev ◽  
...  
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Ultrafast Carrier ◽  
Magneto Optical Kerr Effect

Morphology and Curie Temperature Changes upon Annealing of Co/W(110)

1997 ◽  
Vol 475 ◽  
Author(s):  
A. Bauer ◽  
A. Mühlig ◽  
T. Günther ◽  
M. Farle ◽  
K. Baberschke ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Ultrathin Films ◽  
Kerr Effect ◽  
Room Temperature ◽  
The Other ◽  
Scanning Tunneling ◽  
Optical Kerr Effect ◽  
Tunneling Microscopy ◽  
Temperature Changes ◽  
Magneto Optical Kerr Effect

ABSTRACTAnnealing of CoAV(110) ultrathin films causes rather strong changes of film morphology and magnetic properties, which has been studied by scanning tunneling microscopy (STM) and alternating-current magneto-optical Kerr effect (ac-MOKE). Annealing above 500 K of room-temperature grown 2 monolayers (ML) thick Co/W(110) films leads to the formation of islands and a decrease of the Curie temperature 7C. At 4 ML, on the other hand, a network of interconnected islands is formed upon annealing, resulting in an enhanced TC. While the increase of TC at 4 ML is explained by an increase of the local film thickness, the anomalous TC behavior at 2 ML is assigned to the occurrence of superparamagnetism.

scholarly journals Asymmetric Hysteresis Loops in Co Thin Films

2020 ◽  
Vol 5 (4) ◽  
pp. 71
Author(s):  
Andrea Ehrmann ◽  
Tomasz Blachowicz
Keyword(s):  
Exchange Bias ◽  
Kerr Effect ◽  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Blocking Temperature ◽  
Optical Kerr Effect ◽  
Thin Film System ◽  
Magnetic Hysteresis Loops ◽  
Magneto Optical Kerr Effect

Asymmetric magnetic hysteresis loops are usually found in exchange bias (EB) systems, typically after field cooling a system below the Néel temperature of an antiferromagnet exchange coupled to a ferromagnet. Alternatively, asymmetric hysteresis loops may occur due to undetected minor loops or in systems with a rotational anisotropy. Here, we report on an exchange bias thin film system MgO(100)/Co/CoO, examined at room temperature, which is far above the blocking temperature, by the magneto-optical Kerr effect (MOKE). While the longitudinal hysteresis loops partly show steps which are well-known from diverse purely ferromagnetic systems, the transverse hysteresis loops exhibit clear asymmetries, similar to exchange biased systems at low temperatures, and unusual transverse magnetization values at saturation. Since minor loops and a rotational anisotropy can be excluded in this case, this asymmetry can possibly be a residue of the exchange bias coupling at lower temperatures.

Magneto-optical properties of two-layer film systems based on Fe and Cr

2020 ◽  
Vol 34 (27) ◽  
pp. 2050251
Author(s):  
Oleksandr Bezdidko ◽  
Shkurdoda Yuriy ◽  
Olena Fedchenko ◽  
Iryna Cheshko ◽  
Serhiy Protsenko
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Spin Valve ◽  
Protective Layer ◽  
Optical Kerr Effect ◽  
Multilayer Systems ◽  
Magneto Optical Kerr Effect ◽  
Kerr Angle ◽  
Granular Alloys

The results of the investigation of two-layer Fe/Cr systems using the magneto-optical Kerr effect (MOKE) are presented in this paper. The samples were obtained by thermal evaporation in a vacuum with a thickness of individual layers from 2 nm to 50 nm. It was found that the presence of the Cr layer significantly affects the values of the coercivity and the Kerr angle. At a substrate temperature of 450 K, the value of the coercivity is almost half that of the same sample obtained at room temperature of the substrate. In addition, the influence of the order of deposition of layers, as well as the effect of a thin gold protective layer on the parameters measured by the Kerr method, is shown. These studies have shown that the MOKE can be used as an additional method for studying the composition of multilayer systems, granular alloys and spin-valve systems, using specific software methods.

scholarly journals Ultrafast dynamics of the photo-induced magneto-optical Kerr effect in CdTe at room temperature

2000 ◽  
Vol 62 (16) ◽  
pp. R10610-R10613 ◽  
Author(s):  
A. V. Kimel ◽  
V. V. Pavlov ◽  
R. V. Pisarev ◽  
V. N. Gridnev ◽  
F. Bentivegna ◽  
...  
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Optical Kerr Effect ◽  
Ultrafast Dynamics ◽  
Magneto Optical Kerr Effect

In-Situ Magneto-Optical Kerr Effect of Epitaxial GD (0001)

1993 ◽  
Vol 313 ◽  
Author(s):  
C. Chappert ◽  
D. Weiler ◽  
H. Tang ◽  
J.C. Scott ◽  
H. Hopster ◽  
...  
Keyword(s):  
Growth Temperature ◽  
Kerr Effect ◽  
Room Temperature ◽  
Optical Kerr Effect ◽  
Hysteresis Behavior ◽  
Transverse Geometry ◽  
Spin Polarized ◽  
Annealing Cycle ◽  
Magneto Optical Kerr Effect

ABSTRACTWe have characterized magnetization loops of epitaxially grown Gd (0001) films on W (110) in the temperature range 145≤T≤300K. This was accomplished by measuring magneto-optical Kerr loops in UHV, in the transverse geometry, using a 2×10-4 deg sensitivity differential detector and He-Ne laser light.Films grown in the Stranski-Krastanov (SK) Mode (growth temperature 400°C) and films grown in a Frank-van-der-Merwe (FM) like Mode (growth temperature 20°C) behave significantly differently. While the room temperature grown films (FM) show square hysteresis behavior only after an annealing cycle to at least 300°C, the higher growth temperature (SK) leads to highly remanent films in the as grown state.The hysteresis behavior of these films is most important in conjunction with recently reported spin-polarized photoemission results, which showed that the growth temperature and therefore the film morphology has a strong influence on the surface magnetic reconstruction of Gd (0001) [1].

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