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Dr' Joshua M' Pomeroy,

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Huge RA product range ... would require the development of a new recipe a huge expense! ... for high density hard drive sensor packages requires a 'tool' ... – PowerPoint PPT presentation

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Title: Dr' Joshua M' Pomeroy,


1
Advanced materials synthesis for spin-based
electronics (a new process approach to hard
drive read heads)
  • Dr. Joshua M. Pomeroy,
  • Dr. H. Grube, Dr. A.C. Perrella
  • recently deceased

joshua.pomeroy_at_nist.gov
2
Motivating Objective
  • Electronic device performance can be improved by
    producing materials with ideal properties that
    are not intrinsic to known materials
  • One strategy is to seek new, undiscovered
    materials with specific properties
  • Alternatively,
  • NIST process constructs combinations of known
    materials such that the hybrids have properties
    not native to the constituents

3
Specific Market Opportunity
Moores Law of Magnetic Recording (hard
drives) We want more storage capacity, but
physically smaller hard drives
Literally EVERY computer sold has a hard drive
4
Hard drives Three important pieces
Materials Research Society Bulletin 31 p. 379
  • Write Get information onto paper OK
  • Retain Paper must last a long time OK
  • Read Have to restore the information Challenges

5
Resistance Area product
  • Resistance x Area (RA) -resistance property of
    layered materials
  • For the same layers
  • ½ area 2 x Resistance
  • Resistance x Capacitance (RC)
  • speed large RC slow

A x R RA
½ A x 2 R RA
  • Engineers like resistance to stay the same, even
    if size (area) changes, therefore, need
    adjustable RA product

6
Two Read sensors RA product limitation
  • Low resistance metal based CPP-GMR type sensors
  • (metal/metal/metal layer structures)
  • RA m? mm2
  • Problem very small signal!
  • High resistance insulator based MTJ type
    sensors
  • (metal/insulator/metal layer structures)
  • RA M? mm2
  • Problem too slow (RC too big)!

7
Modified Oxides Magnetic Sensors
  • Industry Need Continuously variable RA for a
    single sensor design with useable MR (signal
    strength).

8
Overview of Method
  • Build the base of the electronic device by
    depositing electrodes and an insulating layer
  • Expose the insulating layer to highly charged
    ions (Coulomb bombs) creating small, individual
    craters in the insulator
  • Deposit upper device structure over the
    irradiated insulator, thereby filling the craters
    with metal
  • The layer that was initially an insulator becomes
    a combination of metal and insulator

Patent Pending Application 12/036,729
licensing opportunities available.
9
Huge RA product range from one recipe
All points produced from one recipe
Using conventional strategies, each data point
would require the development of a new recipea
huge expense!
10
Modified Oxide Read Sensor Performance
MR gt 20 (good signal)
NIST process is compatible with working read
sensors
11
Product Development Opportunities
  • Specific market opportunity NIST process
    provides variable-RA read sensors like those
    required for high density hard drive sensor
    packages requires a tool
  • This example also maps to MRAM industry, and
    other resistance based sensor markets
  • While the ultimate customer is likely a large
    magnetic storage company, individual process
    tools are developed and provided by a wide range
    of smaller companies
  • Patent Application 12/036,729 licensing
    opportunities available.
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