Strong memory effect at room temperature in nanostructured granular alloy Co0.3Cu0.7

RSC Advances ◽  
2015 ◽  
Vol 5 (116) ◽  
pp. 95695-95702 ◽  
Author(s):  
S. Dhara ◽  
R. Roy Chowdhury ◽  
B. Bandyopadhyay
Keyword(s):  
Temperature Distribution ◽  
Memory Effect ◽  
Room Temperature ◽  
Blocking Temperature ◽  
Magnetic Memory

Non-interacting magnetic CoCu nanoparticles with a blocking temperature distribution show strong magnetic memory effect even at room temperature.

scholarly journals Room Temperature Magnetic Memory Effect in Nanodiamond/γ-Fe2O3 Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 648
Author(s):  
Ashish Chhaganlal Gandhi ◽  
Rajakar Selvam ◽  
Chia-Liang Cheng ◽  
Sheng Yun Wu
Keyword(s):  
Memory Effect ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Relaxation Times ◽  
Weight Fraction ◽  
Wide Distribution ◽  
Blocking Temperature ◽  
Magnetic Memory ◽  
Potential Applications ◽  
Fe2o3 Nanoparticle

We report a room temperature magnetic memory effect (RT-MME) from magnetic nanodiamond (MND) (ND)/γ-Fe2O3 nanocomposites. The detailed crystal structural analysis of the diluted MND was performed by synchrotron radiation X-ray diffraction, revealing the composite nature of MND having 99 and 1% weight fraction ND and γ-Fe2O3 phases, respectively. The magnetic measurements carried out using a DC SQUID magnetometer show the non-interacting superparamagnetic nature of γ-Fe2O3 nanoparticles in MND have a wide distribution in the blocking temperature. Using different temperature, field, and time relaxation protocols, the memory phenomenon in the DC magnetization has been observed at room temperature (RT). These findings suggest that the dynamics of MND are governed by a wide distribution of particle relaxation times, which arise from the distribution of γ-Fe2O3 nanoparticle size. The observed RT ferromagnetism coupled with MME in MND will find potential applications in ND-based spintronics.

Magnetic memory effect at room temperature in exchange coupled NiFe2O4-NiO nanogranular system

2017 ◽  
Vol 111 (18) ◽  
pp. 182406 ◽  
Author(s):  
Zhaoming Tian ◽  
Longmeng Xu ◽  
Yuxia Gao ◽  
Songliu Yuan ◽  
Zhengcai Xia
Keyword(s):  
Memory Effect ◽  
Room Temperature ◽  
Magnetic Memory

Field pulse induced magnetic memory effect at room temperature in exchange coupled NiFe2O4/NiO nanocomposites

2019 ◽  
Vol 469 ◽  
pp. 504-509 ◽  
Author(s):  
Longmeng Xu ◽  
Yuxia Gao ◽  
Ashtar Malik ◽  
Yong Liu ◽  
Gaoshang Gong ◽  
...  
Keyword(s):  
Memory Effect ◽  
Room Temperature ◽  
Magnetic Memory ◽  
Field Pulse

Surface-spin driven room temperature magnetic memory effect in Fe-substituted NiO nanoparticles

2021 ◽  
Vol 536 ◽  
pp. 147856
Author(s):  
Ashish Chhaganlal Gandhi ◽  
Hsin-Hao Chiu ◽  
Kuan-Ting Wu ◽  
Chia-Liang Cheng ◽  
Sheng Yun Wu
Keyword(s):  
Memory Effect ◽  
Room Temperature ◽  
Magnetic Memory ◽  
Nio Nanoparticles ◽  
Surface Spin

High performance shape memory effect in nitinol wire for actuators with increased operating temperature range

2014 ◽  
Vol 07 (05) ◽  
pp. 1450063 ◽  
Author(s):  
Riccardo Casati ◽  
Carlo Alberto Biffi ◽  
Maurizio Vedani ◽  
Ausonio Tuissi
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
High Performance ◽  
Room Temperature ◽  
Operating Temperature ◽  
Niti Wire ◽  
Shape Memory Actuators ◽  
Nitinol Wire ◽  
Operating Temperature Range

In this research, the high performance shape memory effect (HP-SME) is experimented on a shape memory NiTi wire, with austenite finish temperature higher than room temperature. The HP-SME consists in the thermal cycling of stress induced martensite and it allows achieving mechanical work higher than that produced by conventional shape memory actuators based on the heating/cooling of detwinned martensite. The Nitinol wire was able to recover about 5.5% of deformation under a stress of 600 MPa and to withstand about 5000 cycles before failure. HP-SME path increased the operating temperature of the shape memory actuator wire. Functioning temperatures higher than 100°C was reached.

scholarly journals Magnetic memory based on magnetic alignment of a paramagnetic ionic liquid near room temperature

2011 ◽  
Vol 47 (15) ◽  
pp. 4475 ◽  
Author(s):  
Yusuke Funasako ◽  
Tomoyuki Mochida ◽  
Takashi Inagaki ◽  
Takahiro Sakurai ◽  
Hitoshi Ohta ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Magnetic Alignment ◽  
Magnetic Memory

scholarly journals Shape memory effect, temperature distribution and mechanical properties of friction stir welded nitinol

2019 ◽  
Vol 776 ◽  
pp. 334-345 ◽  
Author(s):  
S.S. Mani Prabu ◽  
H.C. Madhu ◽  
Chandra S. Perugu ◽  
K. Akash ◽  
R. Mithun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Temperature Distribution ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Friction Stir

Cold Bending a Ni-Ti Shape Memory Alloy Wire

2015 ◽  
Vol 661 ◽  
pp. 98-104 ◽  
Author(s):  
Kuang-Jau Fann ◽  
Pao Min Huang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Room Temperature ◽  
Aging Treatment ◽  
Treatment Temperature ◽  
Bending Test ◽  
Solution Treatment Temperature

Because of being in possession of shape memory effect and superelasticity, Ni-Ti shape memory alloys have earned more intense gaze on the next generation applications. Conventionally, Ni-Ti shape memory alloys are manufactured by hot forming and constraint aging, which need a capital-intensive investment. To have a cost benefit getting rid of plenty of die sets, this study is aimed to form Ni-Ti shape memory alloys at room temperature and to age them at elevated temperature without any die sets. In this study, starting with solution treatments at various temperatures, which served as annealing process, Ni-rich Ni-Ti shape memory alloy wires were bent by V-shaped punches in different curvatures at room temperature. Subsequently, the wires were aged at different temperatures to have shape memory effect. As a result, springback was found after withdrawing the bending punch and further after the aging treatment as well. A higher solution treatment temperature or a smaller bending radius leads to a smaller springback, while a higher aging treatment temperature made a larger springback. This springback may be compensated by bending the wires in further larger curvatures to keep the shape accuracy as designed. To explore the shape memory effect, a reverse bending test was performed. It shows that all bent wires after aging had a shape recovery rate above 96.3% on average.

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