Using a spin torque nano-oscillator to read memory based on the magnetic permeability

被引：10

作者：

Petrie, J. R. ^{[1
]}

Urazhdin, S. ^{[2
]}

Wieland, K. A. ^{[1
]}

Fischer, G. A. ^{[1
]}

Edelstein, A. S. ^{[1
]}

机构：

[1] US Army Res Lab, Adelphi, MD 20873 USA

[2] Emory Univ, Dept Phys, Atlanta, GA 30322 USA

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2014年 / 47卷 / 05期

基金：

美国国家科学基金会;

关键词：

spin torque nano-oscillator; magnetic permeability; memory; DRIVEN; MEDIA; NOISE;

D O I：

10.1088/0022-3727/47/5/055002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present an archival memory utilizing a spin torque nano-oscillator (STNO) to read bits of data with different magnetic permeability. Basing a magnetic memory on this intrinsic property rather than remanent magnetization reduces the risk of data corruption. The permeability of the bits is read as changes in an applied probe field near the media. These changes in the probe field are measured by detecting microwave frequency shifts in STNOs. The probe field can be tuned over hundreds of Oe to optimize the reading of the media. Using a 400 Oe probe field, we have measured 2% frequency shifts in a STNO near micrometre-sized bits of (1) lithographically-patterned permalloy lines and (2) laser-crystallized Metglas lines. Data from either media was not corrupted by exposure to fields of 6400 Oe and temperatures of 523 K.

引用

页数：7

共 29 条

[1] Scaling tape-recording areal densities to 100 Gb/in2 [J].