Stereotactic Helium-Ion Irradiation for Cushing�s Disease, Prolactinoma, and Nonsecreting Adenoma

2015 ◽  
pp. 66-74 ◽  
Author(s):  
Richard P. Levy ◽  
Kenneth A. Frankel ◽  
Richard A. Ricciardi ◽  
Anna E. Rhoades ◽  
Linglei L. Xu
Keyword(s):  
Ion Irradiation ◽  
Helium Ion

Magnetization dynamics of irradiation-fabricated perpendicularly magnetized dots inside a softer magnetic matrix

2003 ◽  
Vol 777 ◽  
Author(s):  
T. Devolder ◽  
M. Belmeguenai ◽  
C. Chappert ◽  
H. Bernas ◽  
Y. Suzuki
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Magnetization Reversal ◽  
Ion Irradiation ◽  
Magnetic Nanostructures ◽  
Magnetic Storage ◽  
Exchange Field ◽  
Static Magnetization ◽  
Specific Domain ◽  
Helium Ion

AbstractGlobal Helium ion irradiation can tune the magnetic properties of thin films, notably their magneto-crystalline anisotropy. Helium ion irradiation through nanofabricated masks can been used to produce sub-micron planar magnetic nanostructures of various types. Among these, perpendicularly magnetized dots in a matrix of weaker magnetic anisotropy are of special interest because their quasi-static magnetization reversal is nucleation-free and proceeds by a very specific domain wall injection from the magnetically “soft” matrix, which acts as a domain wall reservoir for the “hard” dot. This guarantees a remarkably weak coercivity dispersion. This new type of irradiation-fabricated magnetic device can also be designed to achieve high magnetic switching speeds, typically below 100 ps at a moderate applied field cost. The speed is obtained through the use of a very high effective magnetic field, and high resulting precession frequencies. During magnetization reversal, the effective field incorporates a significant exchange field, storing energy in the form of a domain wall surrounding a high magnetic anisotropy nanostructure's region of interest. The exchange field accelerates the reversal and lowers the cost in reversal field. Promising applications to magnetic storage are anticipated.

The influence of helium ion irradiation on amorphous hydrocarbon films

2013 ◽  
Vol 435 (1-3) ◽  
pp. 214-221 ◽  
Author(s):  
Hongyu Fan ◽  
Li Sun ◽  
Deming Yang ◽  
Jinhai Niu ◽  
Liping Guo ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Hydrocarbon Films ◽  
Helium Ion

Self-organized nanostructure formation on the graphite surface induced by helium ion irradiation

2018 ◽  
Vol 382 (24) ◽  
pp. 1601-1608 ◽  
Author(s):  
N.J. Dutta ◽  
S.R. Mohanty ◽  
N. Buzarbaruah ◽  
M. Ranjan ◽  
R.S. Rawat
Keyword(s):  
Ion Irradiation ◽  
Graphite Surface ◽  
Nanostructure Formation ◽  
Self Organized ◽  
Helium Ion

Irradiation damage and mechanical properties in Fe-Au and Fe-Cu model alloys under helium ion irradiation

2020 ◽  
Vol 504 ◽  
pp. 144383 ◽  
Author(s):  
Shasha Zhang ◽  
Zhengjun Yao ◽  
Zhaokuan Zhang ◽  
Moliar Oleksandr
Keyword(s):  
Mechanical Properties ◽  
Ion Irradiation ◽  
Irradiation Damage ◽  
Helium Ion
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